NOTE: This page was generated from the Puppet source code on 2020-06-30 08:58:23 +0100
This page is a list of Puppet’s built-in functions, with descriptions of what they do and how to use them.
Functions are plugins you can call during catalog compilation. A call to any function is an expression that resolves to a value. For more information on how to call functions, see the language reference page about function calls.
Many of these function descriptions include auto-detected signatures, which are short reminders of the function’s allowed arguments. These signatures aren’t identical to the syntax you use to call the function; instead, they resemble a parameter list from a Puppet class, defined resource type, function, or lambda. The syntax of a signature is:
<FUNCTION NAME>(<DATA TYPE> <ARGUMENT NAME>, ...)
The <DATA TYPE>
is a Puppet data type value, like String
or
Optional[Array[String]]
. The <ARGUMENT NAME>
is a descriptive name chosen by the function’s author to
indicate what the argument is used for.
Optional
data type can be omitted from the function call.*$values
) can be repeated any number of times.&$block
) aren’t normal arguments; they represent a code block, provided
with Puppet’s lambda syntax.
abs
Returns the absolute value of a Numeric value, for example -34.56 becomes 34.56. Takes a single Integer
or Float
value as an argument.
Deprecated behavior
For backwards compatibility reasons this function also works when given a number in String
format such that it first attempts
to covert it to either a Float
or an Integer
and then taking the absolute value of the result. Only strings
representing a number in decimal format is supported - an error is raised if value is not decimal (using base 10). Leading 0 chars in the
string are ignored. A floating point value in string form can use some forms of scientific notation but not all.
Callers should convert strings to Numeric
before calling this function to have full control over the conversion.
abs(Numeric($str_val))
It is worth noting that Numeric
can convert to absolute value directly as in the following examples:
Numeric($strval, true) # Converts to absolute Integer or Float
Integer($strval, 10, true) # Converts to absolute Integer using base 10 (decimal)
Integer($strval, 16, true) # Converts to absolute Integer using base 16 (hex)
Float($strval, true) # Converts to absolute Float
Signature 1
abs(Numeric $val)
Signature 2
abs(String $val)
alert
Logs a message on the server at level alert
.
alert(Any *$values)
*values
— The values to log.Return type(s): Undef
.
all
Runs a lambda repeatedly using each value in a data structure until
the lambda returns a non “truthy” value which makes the function return false
, or if the end of the iteration is reached,
true
is returned.
This function takes two mandatory arguments, in this order:
$data.all |$parameter| { <PUPPET CODE BLOCK> }
or
all($data) |$parameter| { <PUPPET CODE BLOCK> }
# For the array $data, run a lambda that checks that all values are multiples of 10
$data = [10, 20, 30]
notice $data.all |$item| { $item % 10 == 0 }
Would notice true
.
When the first argument is a Hash
, Puppet passes each key and value pair to the lambda as an array in the form [key,
value]
.
# For the hash $data, run a lambda using each item as a key-value array
$data = { 'a_0'=> 10, 'b_1' => 20 }
notice $data.all |$item| { $item[1] % 10 == 0 }
Would notice true
if all values in the hash are multiples of 10.
When the lambda accepts two arguments, the first argument gets the index in an array or the key from a hash, and the second argument the value.
# Check that all values are a multiple of 10 and keys start with 'abc'
$data = {abc_123 => 10, abc_42 => 20, abc_blue => 30}
notice $data.all |$key, $value| { $value % 10 == 0 and $key =~ /^abc/ }
Would notice true.
For an general examples that demonstrates iteration, see the Puppet iteration documentation.
Signature 1
all(Hash[Any, Any] $hash, Callable[2,2] &$block)
Signature 2
all(Hash[Any, Any] $hash, Callable[1,1] &$block)
Signature 3
all(Iterable $enumerable, Callable[2,2] &$block)
Signature 4
all(Iterable $enumerable, Callable[1,1] &$block)
annotate
Handles annotations on objects. The function can be used in four different ways.
With two arguments, an Annotation
type and an object, the function returns the annotation for the object of the given type,
or undef
if no such annotation exists.
$annotation = Mod::NickNameAdapter.annotate(o)
$annotation = annotate(Mod::NickNameAdapter.annotate, o)
With three arguments, an Annotation
type, an object, and a block, the function returns the annotation for the object of the
given type, or annotates it with a new annotation initialized from the hash returned by the given block when no such annotation exists. The
block will not be called when an annotation of the given type is already present.
$annotation = Mod::NickNameAdapter.annotate(o) || { { 'nick_name' => 'Buddy' } }
$annotation = annotate(Mod::NickNameAdapter.annotate, o) || { { 'nick_name' => 'Buddy' } }
With three arguments, an Annotation
type, an object, and an Hash
, the function will annotate the given object
with a new annotation of the given type that is initialized from the given hash. An existing annotation of the given type is discarded.
$annotation = Mod::NickNameAdapter.annotate(o, { 'nick_name' => 'Buddy' })
$annotation = annotate(Mod::NickNameAdapter.annotate, o, { 'nick_name' => 'Buddy' })
With three arguments, an Annotation
type, an object, and an the string clear
, the function will clear the
annotation of the given type in the given object. The old annotation is returned if it existed.
$annotation = Mod::NickNameAdapter.annotate(o, clear)
$annotation = annotate(Mod::NickNameAdapter.annotate, o, clear)
With three arguments, the type Pcore
, an object, and a Hash of hashes keyed by Annotation
types, the function
will annotate the given object with all types used as keys in the given hash. Each annotation is initialized with the nested hash for the
respective type. The annotated object is returned.
$person = Pcore.annotate(Mod::Person({'name' => 'William'}), {
Mod::NickNameAdapter >= { 'nick_name' => 'Bill' },
Mod::HobbiesAdapter => { 'hobbies' => ['Ham Radio', 'Philatelist'] }
})
Signature 1
annotate(Type[Annotation] $type, Any $value, Optional[Callable[0, 0]] &$block)
Signature 2
annotate(Type[Annotation] $type, Any $value, Variant[Enum[clear],Hash[Pcore::MemberName,Any]] $annotation_hash)
Signature 3
annotate(Type[Pcore] $type, Any $value, Hash[Type[Annotation], Hash[Pcore::MemberName,Any]] $annotations)
any
Runs a lambda repeatedly using each value in a data structure until
the lambda returns a “truthy” value which makes the function return true
, or if the end of the iteration is reached, false is
returned.
This function takes two mandatory arguments, in this order:
$data.any |$parameter| { <PUPPET CODE BLOCK> }
or
any($data) |$parameter| { <PUPPET CODE BLOCK> }
# For the array $data, run a lambda that checks if an unknown hash contains those keys
$data = ["routers", "servers", "workstations"]
$looked_up = lookup('somekey', Hash)
notice $data.any |$item| { $looked_up[$item] }
Would notice true
if the looked up hash had a value that is neither false
nor undef
for at least
one of the keys. That is, it is equivalent to the expression $looked_up[routers] || $looked_up[servers] ||
$looked_up[workstations]
.
When the first argument is a Hash
, Puppet passes each key and value pair to the lambda as an array in the form [key,
value]
.
# For the hash $data, run a lambda using each item as a key-value array.
$data = {"rtr" => "Router", "svr" => "Server", "wks" => "Workstation"}
$looked_up = lookup('somekey', Hash)
notice $data.any |$item| { $looked_up[$item[0]] }
Would notice true
if the looked up hash had a value for one of the wanted key that is neither false
nor
undef
.
When the lambda accepts two arguments, the first argument gets the index in an array or the key from a hash, and the second argument the value.
# Check if there is an even numbered index that has a non String value
$data = [key1, 1, 2, 2]
notice $data.any |$index, $value| { $index % 2 == 0 and $value !~ String }
Would notice true as the index 2
is even and not a String
For an general examples that demonstrates iteration, see the Puppet iteration documentation.
Signature 1
any(Hash[Any, Any] $hash, Callable[2,2] &$block)
Signature 2
any(Hash[Any, Any] $hash, Callable[1,1] &$block)
Signature 3
any(Iterable $enumerable, Callable[2,2] &$block)
Signature 4
any(Iterable $enumerable, Callable[1,1] &$block)
assert_type
Returns the given value if it is of the given data type, or otherwise either raises an error or executes an optional two-parameter lambda.
The function takes two mandatory arguments, in this order:
$raw_username = 'Amy Berry'
# Assert that $raw_username is a non-empty string and assign it to $valid_username.
$valid_username = assert_type(String[1], $raw_username)
# $valid_username contains "Amy Berry".
# If $raw_username was an empty string or a different data type, the Puppet run would
# fail with an "Expected type does not match actual" error.
You can use an optional lambda to provide enhanced feedback. The lambda takes two mandatory parameters, in this order:
$raw_username = 'Amy Berry'
# Assert that $raw_username is a non-empty string and assign it to $valid_username.
# If it isn't, output a warning describing the problem and use a default value.
$valid_username = assert_type(String[1], $raw_username) |$expected, $actual| {
warning( "The username should be \'${expected}\', not \'${actual}\'. Using 'anonymous'." )
'anonymous'
}
# $valid_username contains "Amy Berry".
# If $raw_username was an empty string, the Puppet run would set $valid_username to
# "anonymous" and output a warning: "The username should be 'String[1, default]', not
# 'String[0, 0]'. Using 'anonymous'."
For more information about data types, see the documentation.
Signature 1
assert_type(Type $type, Any $value, Optional[Callable[Type, Type]] &$block)
Signature 2
assert_type(String $type_string, Any $value, Optional[Callable[Type, Type]] &$block)
binary_file
Loads a binary file from a module or file system and returns its contents as a Binary
. The argument to this function should
be a <MODULE NAME>/<FILE>
reference, which will load <FILE>
from a module’s files
directory. (For example, the reference mysql/mysqltuner.pl
will load the file <MODULES
DIRECTORY>/mysql/files/mysqltuner.pl
.)
This function also accepts an absolute file path that allows reading binary file content from anywhere on disk.
An error is raised if the given file does not exists.
To search for the existence of files, use the find_file()
function.
binary_file(String $path)
break
Breaks an innermost iteration as if it encountered an end of input. This function does not return to the caller.
The signal produced to stop the iteration bubbles up through the call stack until either terminating the innermost iteration or raising an error if the end of the call stack is reached.
The break() function does not accept an argument.
$data = [1,2,3]
notice $data.map |$x| { if $x == 3 { break() } $x*10 }
Would notice the value [10, 20]
function break_if_even($x) {
if $x % 2 == 0 { break() }
}
$data = [1,2,3]
notice $data.map |$x| { break_if_even($x); $x*10 }
Would notice the value [10]
next
and return
break()
call
Calls an arbitrary Puppet function by name.
This function takes one mandatory argument and one or more optional arguments:
This function can also be used to resolve a Deferred
given as the only argument to the function (does not accept arguments
nor a block).
$a = 'notice'
call($a, 'message')
$a = 'each'
$b = [1,2,3]
call($a, $b) |$item| {
notify { $item: }
}
The call
function can be used to call either Ruby functions or Puppet language functions.
When used with Deferred
values, the deferred value can either describe a function call, or a dig into a variable.
$d = Deferred('join', [[1,2,3], ':']) # A future call to join that joins the arguments 1,2,3 with ':'
notice($d.call())
Would notice the string “1:2:3”.
$d = Deferred('$facts', ['processors', 'count'])
notice($d.call())
Would notice the value of $facts['processors']['count']
at the time when the call
is made.
Signature 1
call(String $function_name, Any *$arguments, Optional[Callable] &$block)
Signature 2
call(Deferred $deferred)
camelcase
Creates a Camel Case version of a String
This function is compatible with the stdlib function with the same name.
The function does the following:
String
the conversion replaces all combinations of *_(char)* with an upcased version of the character following the
_. This is done using Ruby system locale which handles some, but not all special international up-casing rules (for example German double-s
ß is upcased to "Ss").Iterable[Variant[String, Numeric]]
(for example an Array
) each value is capitalized and the conversion
is not recursive.Numeric
it is simply returned (this is for backwards compatibility).Please note: This function relies directly on Ruby’s String implementation and as such may not be entirely UTF8 compatible. To ensure best compatibility please use this function with Ruby 2.4.0 or greater - https://bugs.ruby-lang.org/issues/10085.
'hello_friend'.camelcase()
camelcase('hello_friend')
Would both result in "HelloFriend"
['abc_def', 'bcd_xyz'].camelcase()
camelcase(['abc_def', 'bcd_xyz'])
Would both result in ['AbcDef', 'BcdXyz']
Signature 1
camelcase(Numeric $arg)
Signature 2
camelcase(String $arg)
Signature 3
camelcase(Iterable[Variant[String, Numeric]] $arg)
capitalize
Capitalizes the first character of a String, or the first character of every String in an Iterable value (such as an Array).
This function is compatible with the stdlib function with the same name.
The function does the following:
String
, a string with its first character in upper case version is returned. This is done using Ruby system locale
which handles some, but not all special international up-casing rules (for example German double-s ß is capitalized to “Ss”).Iterable[Variant[String, Numeric]]
(for example an Array
) each value is capitalized and the conversion
is not recursive.Numeric
it is simply returned (this is for backwards compatibility).Please note: This function relies directly on Ruby’s String implementation and as such may not be entirely UTF8 compatible. To ensure best compatibility please use this function with Ruby 2.4.0 or greater - https://bugs.ruby-lang.org/issues/10085.
'hello'.capitalize()
upcase('hello')
Would both result in “Hello”
['abc', 'bcd'].capitalize()
capitalize(['abc', 'bcd'])
Would both result in [‘Abc’, ‘Bcd’]
Signature 1
capitalize(Numeric $arg)
Signature 2
capitalize(String $arg)
Signature 3
capitalize(Iterable[Variant[String, Numeric]] $arg)
ceiling
Returns the smallest Integer
greater or equal to the argument. Takes a single numeric value as an argument.
This function is backwards compatible with the same function in stdlib and accepts a Numeric
value. A String
that can be converted to a floating point number can also be used in this version - but this is deprecated.
In general convert string input to Numeric
before calling this function to have full control over how the conversion is
done.
Signature 1
ceiling(Numeric $val)
Signature 2
ceiling(String $val)
chomp
Returns a new string with the record separator character(s) removed. The record separator is the line ending characters \r
and \n
.
This function is compatible with the stdlib function with the same name.
The function does the following:
String
the conversion removes \r\n
, \n
or \r
from the end of a string.Iterable[Variant[String, Numeric]]
(for example an Array
) each value is processed and the conversion
is not recursive.Numeric
it is simply returned (this is for backwards compatibility)."hello\r\n".chomp()
chomp("hello\r\n")
Would both result in "hello"
["hello\r\n", "hi\r\n"].chomp()
chomp(["hello\r\n", "hi\r\n"])
Would both result in ['hello', 'hi']
Signature 1
chomp(Numeric $arg)
Signature 2
chomp(String $arg)
Signature 3
chomp(Iterable[Variant[String, Numeric]] $arg)
chop
Returns a new string with the last character removed. If the string ends with \r\n
, both characters are removed. Applying
chop to an empty string returns an empty string. If you wish to merely remove record separators then you should use the chomp
function.
This function is compatible with the stdlib function with the same name.
The function does the following:
String
the conversion removes the last character, or if it ends with \r\n` it removes both. If String is empty an
empty string is returned.Iterable[Variant[String, Numeric]]
(for example an Array
) each value is processed and the conversion
is not recursive.Numeric
it is simply returned (this is for backwards compatibility)."hello\r\n".chop()
chop("hello\r\n")
Would both result in "hello"
"hello".chop()
chop("hello")
Would both result in "hell"
["hello\r\n", "hi\r\n"].chop()
chop(["hello\r\n", "hi\r\n"])
Would both result in ['hello', 'hi']
Signature 1
chop(Numeric $arg)
Signature 2
chop(String $arg)
Signature 3
chop(Iterable[Variant[String, Numeric]] $arg)
compare
Compares two values and returns -1, 0 or 1 if first value is smaller, equal or larger than the second value. The compare function accepts
arguments of the data types String
, Numeric
, Timespan
, Timestamp
, and
Semver
, such that:
Timespan
and Timestamp
can be compared with each other and with Numeric
When comparing two String
values the comparison can be made to consider case by passing a third (optional) boolean
false
value - the default is true
which ignores case as the comparison operators in the Puppet Language.
Signature 1
compare(Numeric $a, Numeric $b)
Signature 2
compare(String $a, String $b, Optional[Boolean] $ignore_case)
Signature 3
compare(Semver $a, Semver $b)
Signature 4
compare(Numeric $a, Variant[Timespan, Timestamp] $b)
Signature 5
compare(Timestamp $a, Variant[Timestamp, Numeric] $b)
Signature 6
compare(Timespan $a, Variant[Timespan, Numeric] $b)
contain
Makes one or more classes be contained inside the current class. If any of these classes are undeclared, they will be declared as if there
were declared with the include
function. Accepts a class name, an array of class names, or a comma-separated list of class
names.
A contained class will not be applied before the containing class is begun, and will be finished before the containing class is finished.
You must use the class’s full name; relative names are not allowed. In addition to names in string form, you may also directly use
Class
and Resource
Type
-values that are produced by evaluating resource and relationship
expressions.
The function returns an array of references to the classes that were contained thus allowing the function call to contain
to
directly continue.
Class
and Resource
Type
-values, absolute namesArray[Type[Class[n]]]
is returned with all the contained classescontain(Any *$names)
convert_to
The convert_to(value, type)
is a convenience function that does the same as new(type, value)
. The difference in
the argument ordering allows it to be used in chained style for improved readability “left to right”.
When the function is given a lambda, it is called with the converted value, and the function returns what the lambda returns, otherwise the converted value.
# The harder to read variant:
# Using new operator - that is "calling the type" with operator ()
Hash(Array("abc").map |$i,$v| { [$i, $v] })
# The easier to read variant:
# using 'convert_to'
"abc".convert_to(Array).map |$i,$v| { [$i, $v] }.convert_to(Hash)
convert_to(Any $value, Type $type, Optional[Any] *$args, Optional[Callable[1,1]] &$block)
create_resources
Converts a hash into a set of resources and adds them to the catalog.
This function takes two mandatory arguments: a resource type, and a hash describing a set of resources. The hash should be in the form
{title => {parameters} }
:
# A hash of user resources:
$myusers = {
'nick' => { uid => '1330',
gid => allstaff,
groups => ['developers', 'operations', 'release'], },
'dan' => { uid => '1308',
gid => allstaff,
groups => ['developers', 'prosvc', 'release'], },
}
create_resources(user, $myusers)
A third, optional parameter may be given, also as a hash:
$defaults = {
'ensure' => present,
'provider' => 'ldap',
}
create_resources(user, $myusers, $defaults)
The values given on the third argument are added to the parameters of each resource present in the set given on the second argument. If a parameter is present on both the second and third arguments, the one on the second argument takes precedence.
This function can be used to create defined resources and classes, as well as native resources.
Virtual and Exported resources may be created by prefixing the type name with @ or @@ respectively. For example, the $myusers hash may be exported in the following manner:
create_resources("@@user", $myusers)
The $myusers may be declared as virtual resources using:
create_resources("@user", $myusers)
Note that create_resources
will filter out parameter values that are undef
so that normal data binding and
puppet default value expressions are considered (in that order) for the final value of a parameter (just as when setting a parameter to
undef
in a puppet language resource declaration).
create_resources()
crit
Logs a message on the server at level crit
.
crit(Any *$values)
*values
— The values to log.Return type(s): Undef
.
debug
Logs a message on the server at level debug
.
debug(Any *$values)
*values
— The values to log.Return type(s): Undef
.
defined
Determines whether a given class or resource type is defined and returns a Boolean value. You can also use defined
to
determine whether a specific resource is defined, or whether a variable has a value (including undef
, as opposed to the variable
never being declared or assigned).
This function takes at least one string argument, which can be a class name, type name, resource reference, or variable reference of the
form '$name'
. (Note that the $
sign is included in the string which must be in single quotes to prevent the
$
character to be interpreted as interpolation.
The defined
function checks both native and defined types, including types provided by modules. Types and classes are matched
by their names. The function matches resource declarations by using resource references.
# Matching resource types
defined("file")
defined("customtype")
# Matching defines and classes
defined("foo")
defined("foo::bar")
# Matching variables (note the single quotes)
defined('$name')
# Matching declared resources
defined(File['/tmp/file'])
Puppet depends on the configuration’s evaluation order when checking whether a resource is declared.
# Assign values to $is_defined_before and $is_defined_after using identical `defined`
# functions.
$is_defined_before = defined(File['/tmp/file'])
file { "/tmp/file":
ensure => present,
}
$is_defined_after = defined(File['/tmp/file'])
# $is_defined_before returns false, but $is_defined_after returns true.
This order requirement only refers to evaluation order. The order of resources in the configuration graph (e.g. with before
or require
) does not affect the defined
function’s behavior.
Warning: Avoid relying on the result of the
defined
function in modules, as you might not be able to guarantee the evaluation order well enough to produce consistent results. This can cause other code that relies on the function’s result to behave inconsistently or fail.
If you pass more than one argument to defined
, the function returns true
if any of the arguments are
defined. You can also match resources by type, allowing you to match conditions of different levels of specificity, such as whether a
specific resource is of a specific data type.
file { "/tmp/file1":
ensure => file,
}
$tmp_file = file { "/tmp/file2":
ensure => file,
}
# Each of these statements return `true` ...
defined(File['/tmp/file1'])
defined(File['/tmp/file1'],File['/tmp/file2'])
defined(File['/tmp/file1'],File['/tmp/file2'],File['/tmp/file3'])
# ... but this returns `false`.
defined(File['/tmp/file3'])
# Each of these statements returns `true` ...
defined(Type[Resource['file','/tmp/file2']])
defined(Resource['file','/tmp/file2'])
defined(File['/tmp/file2'])
defined('$tmp_file')
# ... but each of these returns `false`.
defined(Type[Resource['exec','/tmp/file2']])
defined(Resource['exec','/tmp/file2'])
defined(File['/tmp/file3'])
defined('$tmp_file2')
defined(Variant[String, Type[CatalogEntry], Type[Type[CatalogEntry]]] *$vals)
dig
Returns a value for a sequence of given keys/indexes into a structure, such as an array or hash.
This function is used to “dig into” a complex data structure by using a sequence of keys / indexes to access a value from which the next key/index is accessed recursively.
The first encountered undef
value or key stops the “dig” and undef
is returned.
An error is raised if an attempt is made to “dig” into something other than an undef
(which immediately returns
undef
), an Array
or a Hash
.
$data = {a => { b => [{x => 10, y => 20}, {x => 100, y => 200}]}}
notice $data.dig('a', 'b', 1, 'x')
Would notice the value 100.
This is roughly equivalent to $data['a']['b'][1]['x']
. However, a standard index will return an error and cause catalog
compilation failure if any parent of the final key ('x'
) is undef
. The dig
function will return
undef
, rather than failing catalog compilation. This allows you to check if data exists in a structure without mandating that it
always exists.
dig(Optional[Collection] $data, Any *$arg)
digest
Returns a hash value from a provided string using the digest_algorithm setting from the Puppet config file.
digest()
downcase
Converts a String, Array or Hash (recursively) into lower case.
This function is compatible with the stdlib function with the same name.
The function does the following:
String
, its lower case version is returned. This is done using Ruby system locale which handles some, but not all
special international up-casing rules (for example German double-s ß is upcased to “SS”, whereas upper case double-s is downcased to
ß).Array
and Hash
the conversion to lower case is recursive and each key and value must be convertible by
this function.Hash
is converted, some keys could result in the same key - in those cases, the latest key-value wins. For example
if keys “aBC”, and “abC” where both present, after downcase there would only be one key “abc”.Numeric
it is simply returned (this is for backwards compatibility).Please note: This function relies directly on Ruby’s String implementation and as such may not be entirely UTF8 compatible. To ensure best compatibility please use this function with Ruby 2.4.0 or greater - https://bugs.ruby-lang.org/issues/10085.
'HELLO'.downcase()
downcase('HEllO')
Would both result in “hello”
['A', 'B'].downcase()
downcase(['A', 'B'])
Would both result in [‘a’, ‘b’]
{'A' => 'HEllO', 'B' => 'GOODBYE'}.downcase()
Would result in {'a' => 'hello', 'b' => 'goodbye'}
['A', 'B', ['C', ['D']], {'X' => 'Y'}].downcase
Would result in ['a', 'b', ['c', ['d']], {'x' => 'y'}]
Signature 1
downcase(Numeric $arg)
Signature 2
downcase(String $arg)
Signature 3
downcase(Array[StringData] $arg)
Signature 4
downcase(Hash[StringData, StringData] $arg)
each
Runs a lambda repeatedly using each value in a data structure, then returns the values unchanged.
This function takes two mandatory arguments, in this order:
$data.each |$parameter| { <PUPPET CODE BLOCK> }
or
each($data) |$parameter| { <PUPPET CODE BLOCK> }
When the first argument ($data
in the above example) is an array, Puppet passes each value in turn to the lambda, then
returns the original values.
# For the array $data, run a lambda that creates a resource for each item.
$data = ["routers", "servers", "workstations"]
$data.each |$item| {
notify { $item:
message => $item
}
}
# Puppet creates one resource for each of the three items in $data. Each resource is
# named after the item's value and uses the item's value in a parameter.
When the first argument is a hash, Puppet passes each key and value pair to the lambda as an array in the form [key, value]
and returns the original hash.
# For the hash $data, run a lambda using each item as a key-value array that creates a
# resource for each item.
$data = {"rtr" => "Router", "svr" => "Server", "wks" => "Workstation"}
$data.each |$items| {
notify { $items[0]:
message => $items[1]
}
}
# Puppet creates one resource for each of the three items in $data, each named after the
# item's key and containing a parameter using the item's value.
When the first argument is an array and the lambda has two parameters, Puppet passes the array’s indexes (enumerated from 0) in the first parameter and its values in the second parameter.
# For the array $data, run a lambda using each item's index and value that creates a
# resource for each item.
$data = ["routers", "servers", "workstations"]
$data.each |$index, $value| {
notify { $value:
message => $index
}
}
# Puppet creates one resource for each of the three items in $data, each named after the
# item's value and containing a parameter using the item's index.
When the first argument is a hash, Puppet passes its keys to the first parameter and its values to the second parameter.
# For the hash $data, run a lambda using each item's key and value to create a resource
# for each item.
$data = {"rtr" => "Router", "svr" => "Server", "wks" => "Workstation"}
$data.each |$key, $value| {
notify { $key:
message => $value
}
}
# Puppet creates one resource for each of the three items in $data, each named after the
# item's key and containing a parameter using the item's value.
For an example that demonstrates how to create multiple file
resources using each
, see the Puppet iteration documentation.
Signature 1
each(Hash[Any, Any] $hash, Callable[2,2] &$block)
Signature 2
each(Hash[Any, Any] $hash, Callable[1,1] &$block)
Signature 3
each(Iterable $enumerable, Callable[2,2] &$block)
Signature 4
each(Iterable $enumerable, Callable[1,1] &$block)
emerg
Logs a message on the server at level emerg
.
emerg(Any *$values)
*values
— The values to log.Return type(s): Undef
.
empty
Returns true
if the given argument is an empty collection of values.
This function can answer if one of the following is empty:
Array
, Hash
- having zero entriesString
, Binary
- having zero lengthFor backwards compatibility with the stdlib function with the same name the following data types are also accepted by the function instead of raising an error. Using these is deprecated and will raise a warning:
Numeric
- false
is returned for all Numeric
values.Undef
- true
is returned for all Undef
values.notice([].empty)
notice(empty([]))
# would both notice 'true'
Signature 1
empty(Collection $coll)
Signature 2
empty(String $str)
Signature 3
empty(Numeric $num)
Signature 4
empty(Binary $bin)
Signature 5
empty(Undef $x)
epp
Evaluates an Embedded Puppet (EPP) template file and returns the rendered text result as a String.
epp('<MODULE NAME>/<TEMPLATE FILE>', <PARAMETER HASH>)
The first argument to this function should be a <MODULE NAME>/<TEMPLATE FILE>
reference, which loads
<TEMPLATE FILE>
from <MODULE NAME>
’s templates
directory. In most cases, the last argument
is optional; if used, it should be a hash that contains parameters to
pass to the template.
For example, to call the apache module’s templates/vhost/_docroot.epp
template and pass the docroot
and
virtual_docroot
parameters, call the epp
function like this:
epp('apache/vhost/_docroot.epp', { 'docroot' => '/var/www/html', 'virtual_docroot' => '/var/www/example' })
This function can also accept an absolute path, which can load a template file from anywhere on disk.
Puppet produces a syntax error if you pass more parameters than are declared in the template’s parameter tag. When passing parameters to a template that contains a parameter tag, use the same names as the tag’s declared parameters.
Parameters are required only if they are declared in the called template’s parameter tag without default values. Puppet produces an error
if the epp
function fails to pass any required parameter.
epp(String $path, Optional[Hash[Pattern[/^\w+$/], Any]] $parameters)
err
Logs a message on the server at level err
.
err(Any *$values)
*values
— The values to log.Return type(s): Undef
.
eyaml_lookup_key
The eyaml_lookup_key
is a hiera 5 lookup_key
data provider function. See the configuration guide
documentation for how to use this function.
eyaml_lookup_key(String[1] $key, Hash[String[1],Any] $options, Puppet::LookupContext $context)
fail
Fail with a parse error. Any parameters will be stringified, concatenated, and passed to the exception-handler.
fail()
file
Loads a file from a module and returns its contents as a string.
The argument to this function should be a <MODULE NAME>/<FILE>
reference, which will load
<FILE>
from a module’s files
directory. (For example, the reference mysql/mysqltuner.pl
will
load the file <MODULES DIRECTORY>/mysql/files/mysqltuner.pl
.)
This function can also accept:
file()
filter
Applies a lambda to every value in a data structure and returns an
array or hash containing any elements for which the lambda evaluates to a truthy value (not false
or undef
).
This function takes two mandatory arguments, in this order:
$filtered_data = $data.filter |$parameter| { <PUPPET CODE BLOCK> }
or
$filtered_data = filter($data) |$parameter| { <PUPPET CODE BLOCK> }
When the first argument ($data
in the above example) is an array, Puppet passes each value in turn to the lambda and returns
an array containing the results.
# For the array $data, return an array containing the values that end with "berry"
$data = ["orange", "blueberry", "raspberry"]
$filtered_data = $data.filter |$items| { $items =~ /berry$/ }
# $filtered_data = [blueberry, raspberry]
When the first argument is a hash, Puppet passes each key and value pair to the lambda as an array in the form [key, value]
and returns a hash containing the results.
# For the hash $data, return a hash containing all values of keys that end with "berry"
$data = { "orange" => 0, "blueberry" => 1, "raspberry" => 2 }
$filtered_data = $data.filter |$items| { $items[0] =~ /berry$/ }
# $filtered_data = {blueberry => 1, raspberry => 2}
When the first argument is an array and the lambda has two parameters, Puppet passes the array’s indexes (enumerated from 0) in the first parameter and its values in the second parameter.
# For the array $data, return an array of all keys that both end with "berry" and have
# an even-numbered index
$data = ["orange", "blueberry", "raspberry"]
$filtered_data = $data.filter |$indexes, $values| { $indexes % 2 == 0 and $values =~ /berry$/ }
# $filtered_data = [raspberry]
When the first argument is a hash, Puppet passes its keys to the first parameter and its values to the second parameter.
# For the hash $data, return a hash of all keys that both end with "berry" and have
# values less than or equal to 1
$data = { "orange" => 0, "blueberry" => 1, "raspberry" => 2 }
$filtered_data = $data.filter |$keys, $values| { $keys =~ /berry$/ and $values <= 1 }
# $filtered_data = {blueberry => 1}
Signature 1
filter(Hash[Any, Any] $hash, Callable[2,2] &$block)
Signature 2
filter(Hash[Any, Any] $hash, Callable[1,1] &$block)
Signature 3
filter(Iterable $enumerable, Callable[2,2] &$block)
Signature 4
filter(Iterable $enumerable, Callable[1,1] &$block)
find_file
Finds an existing file from a module and returns its path.
This function accepts an argument that is a String as a <MODULE NAME>/<FILE>
reference, which searches for
<FILE>
relative to a module’s files
directory. (For example, the reference mysql/mysqltuner.pl
will search for the file <MODULES DIRECTORY>/mysql/files/mysqltuner.pl
.)
This function can also accept:
The function returns undef
if none of the given paths were found.
Signature 1
find_file(String *$paths)
Signature 2
find_file(Array[String] *$paths_array)
find_template
Finds an existing template from a module and returns its path.
This function accepts an argument that is a String as a <MODULE NAME>/<TEMPLATE>
reference, which searches for
<TEMPLATE>
relative to a module’s templates
directory on the master. (For example, the reference
mymod/secret.conf.epp
will search for the file <MODULES DIRECTORY>/mymod/templates/secret.conf.epp
.)
The primary use case is for agent-side template rendering with late-bound variables resolved, such as from secret stores inaccessible to the master, such as
$variables = {
'password' => Deferred('vault_lookup::lookup',
['secret/mymod', 'https://vault.example.com:8200']),
}
# compile the template source into the catalog
file { '/etc/secrets.conf':
ensure => file,
content => Deferred('inline_epp',
[find_template('mymod/secret.conf.epp').file, $variables]),
}
This function can also accept:
The function returns undef
if none of the given paths were found.
Signature 1
find_template(String *$paths)
Signature 2
find_template(Array[String] *$paths_array)
flatten
Returns a flat Array produced from its possibly deeply nested given arguments.
One or more arguments of any data type can be given to this function. The result is always a flat array representation where any nested arrays are recursively flattened.
flatten(['a', ['b', ['c']]])
# Would return: ['a','b','c']
To flatten other kinds of iterables (for example hashes, or intermediate results like from a reverse_each
) first convert the
result to an array using Array($x)
, or $x.convert_to(Array)
. See the new
function for details and
options when performing a conversion.
$hsh = { a => 1, b => 2}
# -- without conversion
$hsh.flatten()
# Would return [{a => 1, b => 2}]
# -- with conversion
$hsh.convert_to(Array).flatten()
# Would return [a,1,b,2]
flatten(Array($hsh))
# Would also return [a,1,b,2]
$a1 = [1, [2, 3]]
$a2 = [[4,[5,6]]
$x = 7
flatten($a1, $a2, $x)
# would return [1,2,3,4,5,6,7]
flatten(42)
# Would return [42]
flatten([42])
# Would also return [42]
flatten(Any *$args)
floor
Returns the largest Integer
less or equal to the argument. Takes a single numeric value as an argument.
This function is backwards compatible with the same function in stdlib and accepts a Numeric
value. A String
that can be converted to a floating point number can also be used in this version - but this is deprecated.
In general convert string input to Numeric
before calling this function to have full control over how the conversion is
done.
Signature 1
floor(Numeric $val)
Signature 2
floor(String $val)
fqdn_rand
Usage: fqdn_rand(MAX, [SEED])
. MAX is required and must be a positive integer; SEED is optional and may be any number or
string.
Generates a random Integer number greater than or equal to 0 and less than MAX, combining the $fqdn
fact and the value of
SEED for repeatable randomness. (That is, each node will get a different random number from this function, but a given node’s result will be
the same every time unless its hostname changes.)
This function is usually used for spacing out runs of resource-intensive cron tasks that run on many nodes, which could cause a thundering
herd or degrade other services if they all fire at once. Adding a SEED can be useful when you have more than one such task and need several
unrelated random numbers per node. (For example, fqdn_rand(30)
, fqdn_rand(30, 'expensive job 1')
, and
fqdn_rand(30, 'expensive job 2')
will produce totally different numbers.)
fqdn_rand()
generate
Calls an external command on the Puppet master and returns the results of the command. Any arguments are passed to the external command as arguments. If the generator does not exit with return code of 0, the generator is considered to have failed and a parse error is thrown. Generators can only have file separators, alphanumerics, dashes, and periods in them. This function will attempt to protect you from malicious generator calls (e.g., those with ‘..’ in them), but it can never be entirely safe. No subshell is used to execute generators, so all shell metacharacters are passed directly to the generator, and all metacharacters are returned by the function. Consider cleaning white space from any string generated.
generate()
get
Digs into a value with dot notation to get a value from within a structure.
To dig into a given value, call the function with (at least) two arguments:
undef
(which also makes the result
undef
unless a default value is given).undef
.Error
argument.Dot notation navigation string - The dot string consists of period .
separated segments where each segment
is either the index into an array or the value of a hash key. If a wanted key contains a period it must be quoted to avoid it being taken as
a segment separator. Quoting can be done with either single quotes '
or double quotes "
. If a segment is a decimal
number it is converted to an Integer index. This conversion can be prevented by quoting the value.
#get($facts, 'os.family')
$facts.get('os.family')
Would both result in the value of $facts[‘os’][‘family’]
get([1,2,[{'name' =>'waldo'}]], '2.0.name')
Would result in ‘waldo’
get([1,2,[{'name' =>'waldo'}]], '2.1.name', 'not waldo')
Would result in ‘not waldo’
$x = [1, 2, { 'readme.md' => "This is a readme."}]
$x.get('2."readme.md"')
$x = [1, 2, { '10' => "ten"}]
$x.get('2."0"')
Error Handling - There are two types of common errors that can be handled by giving the function a code block to execute. (A third kind or error; when the navigation string has syntax errors (for example an empty segment or unbalanced quotes) will always raise an error).
The given block will be given an instance of the Error
data type, and it has methods to extract msg
,
issue_code
, kind
, and details
.
The msg
will be a preformatted message describing the error. This is the error message that would have surfaced if there was
no block to handle the error.
The kind
is the string 'SLICE_ERROR'
for both kinds of errors, and the issue_code
is either the
string 'EXPECTED_INTEGER_INDEX'
for an attempt to index into an array with a String, or 'EXPECTED_COLLECTION'
for
an attempt to index into something that is not a Collection.
The details
is a Hash that for both issue codes contain the entry 'walked_path'
which is an Array with each key
in the progression of the dig up to the place where the error occurred.
For an EXPECTED_INTEGER_INDEX
-issue the detail 'index_type'
is set to the data type of the index value and for
an 'EXPECTED_COLLECTION'
-issue the detail 'value_type'
is set to the type of the value.
The logic in the error handling block can inspect the details, and either call fail()
with a custom error message or produce
the wanted value.
If the block produces undef
it will not be replaced with a given default value.
$x = 'blue'
$x.get('0.color', 'green') |$error| { undef } # result is undef
$y = ['blue']
$y.get('color', 'green') |$error| { undef } # result is undef
$x = [1, 2, ['blue']]
$x.get('2.color') |$error| {
notice("Walked path is ${error.details['walked_path']}")
}
Would notice Walked path is [2, color]
Also see:
getvar()
that takes the first segment to be the name of a variable and then delegates to this function.dig()
function which is similar but uses an array of navigation values instead of a dot notation string.get(Any $value, String $dotted_string, Optional[Any] $default_value, Optional[Callable[1,1]] &$block)
getvar
Digs into a variable with dot notation to get a value from a structure.
To get the value from a variable (that may or may not exist), call the function with one or two arguments:
$
, for example
get('facts')
. The variable name can be followed by a dot notation navigation string to dig out a value in the array
or hash value of the variable.undef
.Error
argument.Dot notation navigation string - The dot string consists of period .
separated segments where each segment
is either the index into an array or the value of a hash key. If a wanted key contains a period it must be quoted to avoid it being taken as
a segment separator. Quoting can be done with either single quotes '
or double quotes "
. If a segment is a decimal
number it is converted to an Integer index. This conversion can be prevented by quoting the value.
getvar('facts') # results in the value of $facts
getvar('facts.os.family') # results in the value of $facts['os']['family']
$x = [1,2,[{'name' =>'waldo'}]]
getvar('x.2.1.name', 'not waldo')
# results in 'not waldo'
For further examples and how to perform error handling, see the get()
function which this function delegates to after having
resolved the variable value.
getvar(Pattern[/\A(?:::)?(?:[a-z]\w*::)*[a-z_]\w*(?:\.|\Z)/] $get_string, Optional[Any] $default_value, Optional[Callable[1,1]]
&$block)
group_by
Groups the collection by result of the block. Returns a hash where the keys are the evaluated result from the block and the values are arrays of elements in the collection that correspond to the key.
Signature 1
group_by(Collection $collection, Callable[1,1] &$block)
collection
— A collection of things to group.Return type(s): Hash
.
Group array of strings by length, results in e.g. { 1 => [a, b], 2 => [ab] }
[a, b, ab].group_by | $s | { $s.length } |
Group array of strings by length and index, results in e.g. {1 => [‘a’], 2 => [‘b’, ‘ab’]}
[a, b, ab].group_by | $i, $s | { $i%2 + $s.length } |
Group hash iterating by key-value pair, results in e.g. { 2 => [[‘a’, [1, 2]]], 1 => [[‘b’, [1]]] }
{ a => [1, 2], b => [1] }.group_by | $kv | { $kv[1].length } |
Group hash iterating by key and value, results in e.g. { 2 => [[‘a’, [1, 2]]], 1 => [[‘b’, [1]]] }
{ a => [1, 2], b => [1] }.group_by | $k, $v | { $v.length } |
Signature 2
group_by(Array $array, Callable[2,2] &$block)
Signature 3
group_by(Collection $collection, Callable[2,2] &$block)
hiera
Performs a standard priority lookup of the hierarchy and returns the most specific value for a given key. The returned value can be any type of data.
This function is deprecated in favor of the lookup
function. While this function continues to work, it does
not support:
lookup_options
stored in the dataThe function takes up to three arguments, in this order:
The hiera
function does not find all matches throughout a hierarchy, instead returning the first specific
value starting at the top of the hierarchy. To search throughout a hierarchy, use the hiera_array
or hiera_hash
functions.
# Assuming hiera.yaml
# :hierarchy:
# - web01.example.com
# - common
# Assuming web01.example.com.yaml:
# users:
# - "Amy Barry"
# - "Carrie Douglas"
# Assuming common.yaml:
users:
admins:
- "Edith Franklin"
- "Ginny Hamilton"
regular:
- "Iris Jackson"
- "Kelly Lambert"
# Assuming we are not web01.example.com:
$users = hiera('users', undef)
# $users contains {admins => ["Edith Franklin", "Ginny Hamilton"],
# regular => ["Iris Jackson", "Kelly Lambert"]}
You can optionally generate the default value with a lambda that takes one parameter.
# Assuming the same Hiera data as the previous example:
$users = hiera('users') | $key | { "Key \'${key}\' not found" }
# $users contains {admins => ["Edith Franklin", "Ginny Hamilton"],
# regular => ["Iris Jackson", "Kelly Lambert"]}
# If hiera couldn't match its key, it would return the lambda result,
# "Key 'users' not found".
The returned value’s data type depends on the types of the results. In the example above, Hiera matches the ‘users’ key and returns it as a hash.
See the ‘Using the lookup function’ documentation for how to perform lookup of data. Also see the ‘Using the deprecated hiera functions’ documentation for more information about the Hiera 3 functions.
hiera()
hiera_array
Finds all matches of a key throughout the hierarchy and returns them as a single flattened array of unique values. If any of the matched values are arrays, they’re flattened and included in the results. This is called an array merge lookup.
This function is deprecated in favor of the lookup
function. While this function continues to work, it does
not support:
lookup_options
stored in the dataThe hiera_array
function takes up to three arguments, in this order:
# Assuming hiera.yaml
# :hierarchy:
# - web01.example.com
# - common
# Assuming common.yaml:
# users:
# - 'cdouglas = regular'
# - 'efranklin = regular'
# Assuming web01.example.com.yaml:
# users: 'abarry = admin'
$allusers = hiera_array('users', undef)
# $allusers contains ["cdouglas = regular", "efranklin = regular", "abarry = admin"].
You can optionally generate the default value with a lambda that takes one parameter.
# Assuming the same Hiera data as the previous example:
$allusers = hiera_array('users') | $key | { "Key \'${key}\' not found" }
# $allusers contains ["cdouglas = regular", "efranklin = regular", "abarry = admin"].
# If hiera_array couldn't match its key, it would return the lambda result,
# "Key 'users' not found".
hiera_array
expects that all values returned will be strings or arrays. If any matched value is a hash, Puppet raises a type
mismatch error.
See the ‘Using the lookup function’ documentation for how to perform lookup of data. Also see the ‘Using the deprecated hiera functions’ documentation for more information about the Hiera 3 functions.
hiera_array()
hiera_hash
Finds all matches of a key throughout the hierarchy and returns them in a merged hash.
This function is deprecated in favor of the lookup
function. While this function continues to work, it does
not support:
lookup_options
stored in the dataIf any of the matched hashes share keys, the final hash uses the value from the highest priority match. This is called a hash merge lookup.
The merge strategy is determined by Hiera’s :merge_behavior
setting.
The hiera_hash
function takes up to three arguments, in this order:
# Assuming hiera.yaml
# :hierarchy:
# - web01.example.com
# - common
# Assuming common.yaml:
# users:
# regular:
# 'cdouglas': 'Carrie Douglas'
# Assuming web01.example.com.yaml:
# users:
# administrators:
# 'aberry': 'Amy Berry'
# Assuming we are not web01.example.com:
$allusers = hiera_hash('users', undef)
# $allusers contains {regular => {"cdouglas" => "Carrie Douglas"},
# administrators => {"aberry" => "Amy Berry"}}
You can optionally generate the default value with a lambda that takes one parameter.
# Assuming the same Hiera data as the previous example:
$allusers = hiera_hash('users') | $key | { "Key \'${key}\' not found" }
# $allusers contains {regular => {"cdouglas" => "Carrie Douglas"},
# administrators => {"aberry" => "Amy Berry"}}
# If hiera_hash couldn't match its key, it would return the lambda result,
# "Key 'users' not found".
hiera_hash
expects that all values returned will be hashes. If any of the values found in the data sources are strings or
arrays, Puppet raises a type mismatch error.
See the ‘Using the lookup function’ documentation for how to perform lookup of data. Also see the ‘Using the deprecated hiera functions’ documentation for more information about the Hiera 3 functions.
hiera_hash()
hiera_include
Assigns classes to a node using an array merge lookup that retrieves the value for a user-specified key from Hiera’s data.
This function is deprecated in favor of the lookup
function in combination with include
. While this function
continues to work, it does not support:
lookup_options
stored in the data# In site.pp, outside of any node definitions and below any top-scope variables:
lookup('classes', Array[String], 'unique').include
The hiera_include
function requires:
hiera_include('classes')
) in your environment’s sites.pp
manifest, outside of
any node definitions and below any top-scope variables that Hiera uses in lookups.classes
keys in the appropriate Hiera data sources, with an array for each classes
key and each value of the
array containing the name of a class.The function takes up to three arguments, in this order:
The function uses an array merge lookup to retrieve the
classes
array, so every node gets every class from the hierarchy.
# Assuming hiera.yaml
# :hierarchy:
# - web01.example.com
# - common
# Assuming web01.example.com.yaml:
# classes:
# - apache::mod::php
# Assuming common.yaml:
# classes:
# - apache
# In site.pp, outside of any node definitions and below any top-scope variables:
hiera_include('classes', undef)
# Puppet assigns the apache and apache::mod::php classes to the web01.example.com node.
You can optionally generate the default value with a lambda that takes one parameter.
# Assuming the same Hiera data as the previous example:
# In site.pp, outside of any node definitions and below any top-scope variables:
hiera_include('classes') | $key | {"Key \'${key}\' not found" }
# Puppet assigns the apache and apache::mod::php classes to the web01.example.com node.
# If hiera_include couldn't match its key, it would return the lambda result,
# "Key 'classes' not found".
See the ‘Using the lookup function’ documentation for how to perform lookup of data. Also see the ‘Using the deprecated hiera functions’ documentation for more information about the Hiera 3 functions.
hiera_include()
hocon_data
The hocon_data
is a hiera 5 data_hash
data provider function. See the configuration guide
documentation for how to use this function.
Note that this function is not supported without a hocon library being present.
hocon_data(Struct[{path=>String[1]}] $options, Puppet::LookupContext $context)
import
The import function raises an error when called to inform the user that import is no longer supported.
import(Any *$args)
include
Declares one or more classes, causing the resources in them to be evaluated and added to the catalog. Accepts a class name, an array of class names, or a comma-separated list of class names.
The include
function can be used multiple times on the same class and will only declare a given class once. If a class
declared with include
has any parameters, Puppet will automatically look up values for them in Hiera, using <class
name>::<parameter name>
as the lookup key.
Contrast this behavior with resource-like class declarations (class {'name': parameter => 'value',}
), which must be used
in only one place per class and can directly set parameters. You should avoid using both include
and resource-like declarations
with the same class.
The include
function does not cause classes to be contained in the class where they are declared. For that, see the
contain
function. It also does not create a dependency relationship between the declared class and the surrounding class; for
that, see the require
function.
You must use the class’s full name; relative names are not allowed. In addition to names in string form, you may also directly use
Class
and Resource
Type
-values that are produced by the resource and relationship expressions.
Array[Type[Class]]
of all included classesinclude(Any *$names)
index
Returns the index (or key in a hash) to a first-found value in an Iterable
value.
When called with a lambda the lambda is called repeatedly using each value in a data structure until the lambda returns a “truthy” value which makes the function return the index or key, or if the end of the iteration is reached, undef is returned.
This function can be called in two different ways; with a value to be searched for, or with a lambda that determines if an entry in the iterable matches.
When called with a lambda the function takes two mandatory arguments, in this order:
$data.index |$parameter| { <PUPPET CODE BLOCK> }
or
index($data) |$parameter| { <PUPPET CODE BLOCK> }
$data = ["routers", "servers", "workstations"]
notice $data.index |$value| { $value == 'servers' } # notices 1
notice $data.index |$value| { $value == 'hosts' } # notices undef
$data = {types => ["routers", "servers", "workstations"], colors => ['red', 'blue', 'green']}
notice $data.index |$value| { 'servers' in $value } # notices 'types'
notice $data.index |$value| { 'red' in $value } # notices 'colors'
Note that the lambda gets the value and not an array with [key, value]
as in other iterative functions.
Using a lambda that accepts two values works the same way, it simply gets the index/key as the first parameter, and the value as the second.
# Find the first even numbered index that has a non String value
$data = [key1, 1, 3, 5]
notice $data.index |$idx, $value| { $idx % 2 == 0 and $value !~ String } # notices 2
When called on a String
, the lambda is given each character as a value. What is typically wanted is to find a sequence of
characters which is achieved by calling the function with a value to search for instead of giving a lambda.
# Find first occurrence of 'ah'
$data = "blablahbleh"
notice $data.index('ah') # notices 5
# Find first occurrence of 'la' or 'le'
$data = "blablahbleh"
notice $data.index(/l(a|e)/ # notices 1
When searching in a String
with a given value that is neither String
nor Regexp
the answer is
always undef
. When searching in any other iterable, the value is matched against each value in the iteration using strict Ruby
==
semantics. If Puppet Language semantics are wanted (where string compare is case insensitive) use a lambda and the
==
operator in Puppet.
$data = ['routers', 'servers', 'WORKstations']
notice $data.index('servers') # notices 1
notice $data.index('workstations') # notices undef (not matching case)
For an general examples that demonstrates iteration, see the Puppet iteration documentation.
Signature 1
index(Hash[Any, Any] $hash, Callable[2,2] &$block)
Signature 2
index(Hash[Any, Any] $hash, Callable[1,1] &$block)
Signature 3
index(Iterable $enumerable, Callable[2,2] &$block)
Signature 4
index(Iterable $enumerable, Callable[1,1] &$block)
Signature 5
index(String $str, Variant[String,Regexp] $match)
Signature 6
index(Iterable $enumerable, Any $match)
info
Logs a message on the server at level info
.
info(Any *$values)
*values
— The values to log.Return type(s): Undef
.
inline_epp
Evaluates an Embedded Puppet (EPP) template string and returns the rendered text result as a String.
inline_epp('<EPP TEMPLATE STRING>', <PARAMETER HASH>)
The first argument to this function should be a string containing an EPP template. In most cases, the last argument is optional; if used, it should be a hash that contains parameters to pass to the template.
For example, to evaluate an inline EPP template and pass it the docroot
and virtual_docroot
parameters, call the
inline_epp
function like this:
inline_epp('docroot: <%= $docroot %> Virtual docroot: <%= $virtual_docroot %>', { 'docroot' => '/var/www/html',
'virtual_docroot' => '/var/www/example' })
Puppet produces a syntax error if you pass more parameters than are declared in the template’s parameter tag. When passing parameters to a template that contains a parameter tag, use the same names as the tag’s declared parameters.
Parameters are required only if they are declared in the called template’s parameter tag without default values. Puppet produces an error
if the inline_epp
function fails to pass any required parameter.
An inline EPP template should be written as a single-quoted string or heredoc. A double-quoted string is subject to expression interpolation before the string is parsed as an EPP template.
For example, to evaluate an inline EPP template using a heredoc, call the inline_epp
function like this:
# Outputs 'Hello given argument planet!'
inline_epp(@(END), { x => 'given argument' })
<%- | $x, $y = planet | -%>
Hello <%= $x %> <%= $y %>!
END
inline_epp(String $template, Optional[Hash[Pattern[/^\w+$/], Any]] $parameters)
inline_template
Evaluate a template string and return its value. See the templating docs for more information. Note that if multiple template strings are specified, their output is all concatenated and returned as the output of the function.
inline_template()
join
Joins the values of an Array into a string with elements separated by a delimiter.
Supports up to two arguments
Array
String
if given, and defaults
to an empty string.join(['a','b','c'], ",")
# Would result in: "a,b,c"
Note that array is flattened before elements are joined, but flattening does not extend to arrays nested in hashes or other objects.
$a = [1,2, undef, 'hello', [x,y,z], {a => 2, b => [3, 4]}]
notice join($a, ', ')
# would result in noticing:
# 1, 2, , hello, x, y, z, {"a"=>2, "b"=>[3, 4]}
For joining iterators and other containers of elements a conversion must first be made to an Array
. The reason for this is
that there are many options how such a conversion should be made.
[1,2,3].reverse_each.convert_to(Array).join(', ')
# would result in: "3, 2, 1"
{a => 1, b => 2}.convert_to(Array).join(', ')
# would result in "a, 1, b, 2"
For more detailed control over the formatting (including indentations and line breaks, delimiters around arrays and hash entries, between
key/values in hash entries, and individual formatting of values in the array) see the new
function for String
and
its formatting options for Array
and Hash
.
join(Array $arg, Optional[String] $delimiter)
json_data
The json_data
is a hiera 5 data_hash
data provider function. See the configuration guide
documentation for how to use this function.
json_data(Struct[{path=>String[1]}] $options, Puppet::LookupContext $context)
keys
Returns the keys of a hash as an Array
$hsh = {"apples" => 3, "oranges" => 4 }
$hsh.keys()
keys($hsh)
# both results in the array ["apples", "oranges"]
undef
) unless it is constrained with a
Hash
data type that narrows the allowed data types.keys(Hash $hsh)
length
Returns the length of an Array, Hash, String, or Binary value.
The returned value is a positive integer indicating the number of elements in the container; counting (possibly multibyte) characters for
a String
, bytes in a Binary
, number of elements in an Array
, and number of key-value associations in a
Hash.
"roses".length() # 5
length("violets") # 7
[10, 20].length # 2
{a => 1, b => 3}.length # 2
Signature 1
length(Collection $arg)
Signature 2
length(String $arg)
Signature 3
length(Binary $arg)
lest
Calls a lambda without arguments if the value given to
lest
is undef
. Returns the result of calling the lambda if the argument is undef
, otherwise the given
argument.
The lest
function is useful in a chain of then
calls, or in general as a guard against undef
values. The function can be used to call fail
, or to return a default value.
These two expressions are equivalent:
if $x == undef { do_things() }
lest($x) || { do_things() }
$data = {a => [ b, c ] }
notice $data.dig(a, b, c)
.then |$x| { $x * 2 }
.lest || { fail("no value for $data[a][b][c]" }
Would fail the operation because $data[a][b][c] results in undef
(there is no b
key in a
).
In contrast - this example:
$data = {a => { b => { c => 10 } } }
notice $data.dig(a, b, c)
.then |$x| { $x * 2 }
.lest || { fail("no value for $data[a][b][c]" }
Would notice the value 20
lest(Any $arg, Callable[0,0] &$block)
lookup
Uses the Puppet lookup system to retrieve a value for a given key. By default, this returns the first value found (and fails compilation if no values are available), but you can configure it to merge multiple values into one, fail gracefully, and more.
When looking up a key, Puppet will search up to three tiers of data, in the following order:
<MODULE NAME>::<SOMETHING>
.You must provide the name of a key to look up, and can optionally provide other arguments. You can combine these arguments in the following ways:
lookup( <NAME>, [<VALUE TYPE>], [<MERGE BEHAVIOR>], [<DEFAULT VALUE>] )
lookup( [<NAME>], <OPTIONS HASH> )
lookup( as above ) |$key| { # lambda returns a default value }
Arguments in [square brackets]
are optional.
The arguments accepted by lookup
are as follows:
<NAME>
(string or array) — The name of the key to look up.
<VALUE TYPE>
(data type) — A data type that
must match the retrieved value; if not, the lookup (and catalog compilation) will fail. Defaults to Data
(accepts any normal
value).
<MERGE BEHAVIOR>
(string or hash; see “Merge Behaviors” below) — Whether (and how) to combine
multiple values. If present, this overrides any merge behavior specified in the data sources. Defaults to no value; Puppet will use merge
behavior from the data sources if present, and will otherwise do a first-found lookup.<DEFAULT VALUE>
(any normal value) — If present, lookup
returns this when it can’t find a normal value.
Default values are never merged with found values. Like a normal value, the default must match the value type. Defaults to no value; if
Puppet can’t find a normal value, the lookup (and compilation) will fail.<OPTIONS HASH>
(hash) — Alternate way to set the arguments above, plus some less-common extra options. If you pass an
options hash, you can’t combine it with any regular arguments (except <NAME>
). An options hash can have the following
keys:
'name'
— Same as <NAME>
(argument 1). You can pass this as an argument or in the hash, but not
both.'value_type'
— Same as <VALUE TYPE>
(argument 2).'merge'
— Same as <MERGE BEHAVIOR>
(argument 3).'default_value'
— Same as <DEFAULT VALUE>
(argument 4).'default_values_hash'
(hash) — A hash of lookup keys and default values. If Puppet can’t find a normal value, it will
check this hash for the requested key before giving up. You can combine this with default_value
or a lambda, which will be
used if the key isn’t present in this hash. Defaults to an empty hash.'override'
(hash) — A hash of lookup keys and override values. Puppet will check for the requested key in the
overrides hash first; if found, it returns that value as the final value, ignoring merge behavior. Defaults to an
empty hash.Finally, lookup
can take a lambda, which must accept a single parameter. This is yet another way to set a default value for
the lookup; if no results are found, Puppet will pass the requested key to the lambda and use its result as the default value.
Puppet lookup uses a hierarchy of data sources, and a given key might have values in multiple sources. By default, Puppet returns the first value it finds, but it can also continue searching and merge all the values together.
Note: Data sources can use the special
lookup_options
metadata key to request a specific merge behavior for a key. Thelookup
function will use that requested behavior unless you explicitly specify one.
The valid merge behaviors are:
'first'
— Returns the first value found, with no merging. Puppet lookup’s default behavior.'unique'
(called “array merge” in classic Hiera) — Combines any number of arrays and scalar values to return a merged,
flattened array with all duplicate values removed. The lookup will fail if any hash values are found.'hash'
— Combines the keys and values of any number of hashes to return a merged hash. If the same key exists in multiple
source hashes, Puppet will use the value from the highest-priority data source; it won’t recursively merge the values.'deep'
— Combines the keys and values of any number of hashes to return a merged hash. If the same key exists in multiple
source hashes, Puppet will recursively merge hash or array values (with duplicate values removed from arrays). For conflicting scalar
values, the highest-priority value will win.{'strategy' => 'first'}
, {'strategy' => 'unique'}
, or {'strategy' => 'hash'}
— Same as
the string versions of these merge behaviors.{'strategy' => 'deep', <DEEP OPTION> => <VALUE>, ...}
— Same as 'deep'
, but can adjust the
merge with additional options. The available options are:
'knockout_prefix'
(string or undef) — A string prefix to indicate a value should be removed from the final
result. If a value is exactly equal to the prefix, it will knockout the entire element. Defaults to undef
, which disables
this feature.'sort_merged_arrays'
(boolean) — Whether to sort all arrays that are merged together. Defaults to
false
.'merge_hash_arrays'
(boolean) — Whether to merge hashes within arrays. Defaults to false
.Signature 1
lookup(NameType $name, Optional[ValueType] $value_type, Optional[MergeType] $merge)
Signature 2
lookup(NameType $name, Optional[ValueType] $value_type, Optional[MergeType] $merge, DefaultValueType $default_value)
Signature 3
lookup(NameType $name, Optional[ValueType] $value_type, Optional[MergeType] $merge, BlockType &$block)
Signature 4
lookup(OptionsWithName $options_hash, Optional[BlockType] &$block)
Signature 5
lookup(Variant[String,Array[String]] $name, OptionsWithoutName $options_hash, Optional[BlockType] &$block)
lstrip
Strips leading spaces from a String
This function is compatible with the stdlib function with the same name.
The function does the following:
String
the conversion removes all leading ASCII white space characters such as space, tab, newline, and return. It
does not remove other space-like characters like hard space (Unicode U+00A0). (Tip, /^[[:space:]]/
regular expression matches
all space-like characters).Iterable[Variant[String, Numeric]]
(for example an Array
) each value is processed and the conversion
is not recursive.Numeric
it is simply returned (this is for backwards compatibility)."\n\thello".lstrip()
camelcase("\n\thello")
Would both result in "hello"
["\n\thello", "\n\thi"].lstrip()
lstrip(["\n\thello", "\n\thi"])
Would both result in ['hello', 'hi']
Signature 1
lstrip(Numeric $arg)
Signature 2
lstrip(String $arg)
Signature 3
lstrip(Iterable[Variant[String, Numeric]] $arg)
map
Applies a lambda to every value in a data structure and returns an array containing the results.
This function takes two mandatory arguments, in this order:
$transformed_data = $data.map |$parameter| { <PUPPET CODE BLOCK> }
or
$transformed_data = map($data) |$parameter| { <PUPPET CODE BLOCK> }
When the first argument ($data
in the above example) is an array, Puppet passes each value in turn to the lambda.
# For the array $data, return an array containing each value multiplied by 10
$data = [1,2,3]
$transformed_data = $data.map |$items| { $items * 10 }
# $transformed_data contains [10,20,30]
When the first argument is a hash, Puppet passes each key and value pair to the lambda as an array in the form [key,
value]
.
# For the hash $data, return an array containing the keys
$data = {'a'=>1,'b'=>2,'c'=>3}
$transformed_data = $data.map |$items| { $items[0] }
# $transformed_data contains ['a','b','c']
When the first argument is an array and the lambda has two parameters, Puppet passes the array’s indexes (enumerated from 0) in the first parameter and its values in the second parameter.
# For the array $data, return an array containing the indexes
$data = [1,2,3]
$transformed_data = $data.map |$index,$value| { $index }
# $transformed_data contains [0,1,2]
When the first argument is a hash, Puppet passes its keys to the first parameter and its values to the second parameter.
# For the hash $data, return an array containing each value
$data = {'a'=>1,'b'=>2,'c'=>3}
$transformed_data = $data.map |$key,$value| { $value }
# $transformed_data contains [1,2,3]
Signature 1
map(Hash[Any, Any] $hash, Callable[2,2] &$block)
Signature 2
map(Hash[Any, Any] $hash, Callable[1,1] &$block)
Signature 3
map(Iterable $enumerable, Callable[2,2] &$block)
Signature 4
map(Iterable $enumerable, Callable[1,1] &$block)
match
Matches a regular expression against a string and returns an array containing the match and any matched capturing groups.
The first argument is a string or array of strings. The second argument is either a regular expression, regular expression represented as a string, or Regex or Pattern data type that the function matches against the first argument.
The returned array contains the entire match at index 0, and each captured group at subsequent index values. If the value or expression being matched is an array, the function returns an array with mapped match results.
If the function doesn’t find a match, it returns ‘undef’.
$matches = "abc123".match(/[a-z]+[1-9]+/)
# $matches contains [abc123]
$matches = "abc123".match(/([a-z]+)([1-9]+)/)
# $matches contains [abc123, abc, 123]
$matches = ["abc123","def456"].match(/([a-z]+)([1-9]+)/)
# $matches contains [[abc123, abc, 123], [def456, def, 456]]
Signature 1
match(String $string, Variant[Any, Type] $pattern)
Signature 2
match(Array[String] $string, Variant[Any, Type] $pattern)
max
Returns the highest value among a variable number of arguments. Takes at least one argument.
This function is (with one exception) compatible with the stdlib function with the same name and performs deprecated type conversion before comparison as follows:
String
and the comparison is a lexical compare
where min is the lexicographical later value.The above rules have been deprecated in Puppet 6.0.0 as they produce strange results when given values of mixed data types. In general,
either convert values to be all String
or all Numeric
values before calling the function, or call the function with
a lambda that performs type conversion and comparison. This because one simply cannot compare Boolean
with Regexp
and with any arbitrary Array
, Hash
or Object
and getting a meaningful result.
The one change in the function’s behavior is when the function is given a single array argument. The stdlib implementation would return that array as the result where it now instead returns the max value from that array.
notice(max(1)) # would notice 1
notice(max(1,2)) # would notice 2
notice(max("1", 2)) # would notice 2
notice(max("0777", 512)) # would notice "0777", since "0777" is not converted from octal form
notice(max(0777, 512)) # would notice 512, since 0777 is decimal 511
notice(max('aa', 'ab')) # would notice 'ab'
notice(max(['a'], ['b'])) # would notice ['b'], since "['b']" is after "['a']"
$x = [1,2,3,4]
notice(max(*$x)) # would notice 4
$x = [1,2,3,4]
notice(max($x)) # would notice 4
notice($x.max) # would notice 4
This example shows that a single array argument is used as the set of values as opposed to being a single returned value.
When calling with a lambda, it must accept two variables and it must return one of -1, 0, or 1 depending on if first argument is before/lower than, equal to, or higher/after the second argument.
notice(max("2", "10", "100") |$a, $b| { compare($a, $b) })
Would notice “2” as higher since it is lexicographically higher/after the other values. Without the lambda the stdlib compatible (deprecated) behavior would have been to return “100” since number conversion kicks in.
Signature 1
max(Numeric *$values)
Signature 2
max(String *$values)
Signature 3
max(Array[Numeric] $values, Optional[Callable[2,2]] &$block)
Signature 4
max(Array[String] $values, Optional[Callable[2,2]] &$block)
Signature 5
max(Array $values, Optional[Callable[2,2]] &$block)
Signature 6
max(Any *$values, Callable[2,2] &$block)
Signature 7
max(Any *$values)
md5
Returns a MD5 hash value from a provided string.
md5()
min
Returns the lowest value among a variable number of arguments. Takes at least one argument.
This function is (with one exception) compatible with the stdlib function with the same name and performs deprecated type conversion before comparison as follows:
String
and the comparison is a lexical compare
where min is the lexicographical earlier value.The above rules have been deprecated in Puppet 6.0.0 as they produce strange results when given values of mixed data types. In general,
either convert values to be all String
or all Numeric
values before calling the function, or call the function with
a lambda that performs type conversion and comparison. This because one simply cannot compare Boolean
with Regexp
and with any arbitrary Array
, Hash
or Object
and getting a meaningful result.
The one change in the function’s behavior is when the function is given a single array argument. The stdlib implementation would return that array as the result where it now instead returns the max value from that array.
notice(min(1)) # would notice 1
notice(min(1,2)) # would notice 1
notice(min("1", 2)) # would notice 1
notice(min("0777", 512)) # would notice 512, since "0777" is not converted from octal form
notice(min(0777, 512)) # would notice 511, since 0777 is decimal 511
notice(min('aa', 'ab')) # would notice 'aa'
notice(min(['a'], ['b'])) # would notice ['a'], since "['a']" is before "['b']"
$x = [1,2,3,4]
notice(min(*$x)) # would notice 1
$x = [1,2,3,4]
notice(min($x)) # would notice 1
notice($x.min) # would notice 1
This example shows that a single array argument is used as the set of values as opposed to being a single returned value.
When calling with a lambda, it must accept two variables and it must return one of -1, 0, or 1 depending on if first argument is before/lower than, equal to, or higher/after the second argument.
notice(min("2", "10", "100") |$a, $b| { compare($a, $b) })
Would notice “10” as lower since it is lexicographically lower/before the other values. Without the lambda the stdlib compatible (deprecated) behavior would have been to return “2” since number conversion kicks in.
Signature 1
min(Numeric *$values)
Signature 2
min(String *$values)
Signature 3
min(Array[Numeric] $values, Optional[Callable[2,2]] &$block)
Signature 4
min(Array[String] $values, Optional[Callable[2,2]] &$block)
Signature 5
min(Array $values, Optional[Callable[2,2]] &$block)
Signature 6
min(Any *$values, Callable[2,2] &$block)
Signature 7
min(Any *$values)
module_directory
Finds an existing module and returns the path to its root directory.
The argument to this function should be a module name String For example, the reference mysql
will search for the directory
<MODULES DIRECTORY>/mysql
and return the first found on the modulepath.
This function can also accept:
The function returns undef
if none of the given modules were found
Signature 1
module_directory(String *$names)
Signature 2
module_directory(Array[String] *$names)
new
Creates a new instance/object of a given data type.
This function makes it possible to create new instances of concrete data types. If a block is given it is called with the just created instance as an argument.
Calling this function is equivalent to directly calling the data type:
$a = Integer.new("42")
$b = Integer("42")
These would both convert the string "42"
to the decimal value 42
.
$a = Integer.new("42", 8)
$b = Integer({from => "42", radix => 8})
This would convert the octal (radix 8) number "42"
in string form to the decimal value 34
.
The new function supports two ways of giving the arguments:
Note that it is not possible to create new instances of some abstract data types (for example Variant
). The data type
Optional[T]
is an exception as it will create an instance of T
or undef
if the value to convert is
undef
.
The arguments that can be given is determined by the data type.
An assertion is always made that the produced value complies with the given type constraints.
Integer[0].new("-100")
Would fail with an assertion error (since value is less than 0).
The following sections show the arguments and conversion rules per data type built into the Puppet Type System.
Conversion to these data types is the same as a conversion to the type argument T
. In the case of Optional[T]
it
is accepted that the argument to convert may be undef
. It is however not acceptable to give other arguments (than
undef
) that cannot be converted to T
.
A new Integer
can be created from Integer
, Float
, Boolean
, and String
values. For conversion from String
it is possible to specify the radix (base).
type Radix = Variant[Default, Integer[2,2], Integer[8,8], Integer[10,10], Integer[16,16]]
function Integer.new(
String $value,
Radix $radix = 10,
Boolean $abs = false
)
function Integer.new(
Variant[Numeric, Boolean] $value,
Boolean $abs = false
)
String
the default radix is 10.0b
or 0B
is taken as radix 2.0x
or 0X
is taken as radix 16.0
as radix 8.String
accepts an optional sign in the string.radix
is set to default
, the conversion is based on the leading. characters in the string. A leading “0”
for radix 8, a leading “0x”, or “0X” for radix 16, and leading “0b” or “0B” for binary.Boolean
results in 0 for false
and 1 for true
.Integer
, Float
, and Boolean
ignores the radix.Float
value fractions are truncated (no rounding).abs
is set to true
, the result will be an absolute integer.$a_number = Integer("0xFF", 16) # results in 255
$a_number = Integer("010") # results in 8
$a_number = Integer("010", 10) # results in 10
$a_number = Integer(true) # results in 1
$a_number = Integer(-38, 10, true) # results in 38
A new Float
can be created from Integer
, Float
, Boolean
, and String
values. For conversion from String
both float and integer formats are supported.
function Float.new(
Variant[Numeric, Boolean, String] $value,
Boolean $abs = true
)
.0
is added to the value.Boolean
true
is converted to 1.0, and a false
to 0.0String
format, integer prefixes for hex and binary are understood (but not octal since floating point in string format
may start with a ‘0’).abs
is set to true
, the result will be an absolute floating point value.A new Integer
or Float
can be created from Integer
, Float
, Boolean
and
String
values.
function Numeric.new(
Variant[Numeric, Boolean, String] $value,
Boolean $abs = true
)
Float
, otherwise the value is
an Integer
. The conversion from String
always uses a radix based on the prefix of the string.Boolean
results in 0 for false
and 1 for true
.abs
is set to true
, the result will be an absolute Float
or Integer
value.$a_number = Numeric(true) # results in 1
$a_number = Numeric("0xFF") # results in 255
$a_number = Numeric("010") # results in 8
$a_number = Numeric("3.14") # results in 3.14 (a float)
$a_number = Numeric(-42.3, true) # results in 42.3
$a_number = Numeric(-42, true) # results in 42
A new Timespan
can be created from Integer
, Float
, String
, and Hash
values. Several variants of the constructor are provided.
Timespan from seconds
When a Float is used, the decimal part represents fractions of a second.
function Timespan.new(
Variant[Float, Integer] $value
)
Timespan from days, hours, minutes, seconds, and fractions of a second
The arguments can be passed separately in which case the first four, days, hours, minutes, and seconds are mandatory and the rest are optional. All values may overflow and/or be negative. The internal 128-bit nano-second integer is calculated as:
(((((days * 24 + hours) * 60 + minutes) * 60 + seconds) * 1000 + milliseconds) * 1000 + microseconds) * 1000 + nanoseconds
function Timespan.new(
Integer $days, Integer $hours, Integer $minutes, Integer $seconds,
Integer $milliseconds = 0, Integer $microseconds = 0, Integer $nanoseconds = 0
)
or, all arguments can be passed as a Hash
, in which case all entries are optional:
function Timespan.new(
Struct[{
Optional[negative] => Boolean,
Optional[days] => Integer,
Optional[hours] => Integer,
Optional[minutes] => Integer,
Optional[seconds] => Integer,
Optional[milliseconds] => Integer,
Optional[microseconds] => Integer,
Optional[nanoseconds] => Integer
}] $hash
)
Timespan from String and format directive patterns
The first argument is parsed using the format optionally passed as a string or array of strings. When an array is used, an attempt will be made to parse the string using the first entry and then with each entry in succession until parsing succeeds. If the second argument is omitted, an array of default formats will be used.
An exception is raised when no format was able to parse the given string.
function Timespan.new(
String $string, Variant[String[2],Array[String[2], 1]] $format = <default format>)
)
the arguments may also be passed as a Hash
:
function Timespan.new(
Struct[{
string => String[1],
Optional[format] => Variant[String[2],Array[String[2], 1]]
}] $hash
)
The directive consists of a percent (%) character, zero or more flags, optional minimum field width and a conversion specifier as follows:
%[Flags][Width]Conversion
Flag | Meaning |
---|---|
- | Don’t pad numerical output |
_ | Use spaces for padding |
0 | Use zeros for padding |
Format | Meaning |
---|---|
D | Number of Days |
H | Hour of the day, 24-hour clock |
M | Minute of the hour (00..59) |
S | Second of the minute (00..59) |
L | Millisecond of the second (000..999) |
N | Fractional seconds digits |
The format directive that represents the highest magnitude in the format will be allowed to overflow. I.e. if no “%D” is used but a “%H” is present, then the hours may be more than 23.
The default array contains the following patterns:
['%D-%H:%M:%S', '%D-%H:%M', '%H:%M:%S', '%H:%M']
Examples - Converting to Timespan
$duration = Timespan(13.5) # 13 seconds and 500 milliseconds
$duration = Timespan({days=>4}) # 4 days
$duration = Timespan(4, 0, 0, 2) # 4 days and 2 seconds
$duration = Timespan('13:20') # 13 hours and 20 minutes (using default pattern)
$duration = Timespan('10:03.5', '%M:%S.%L') # 10 minutes, 3 seconds, and 5 milli-seconds
$duration = Timespan('10:03.5', '%M:%S.%N') # 10 minutes, 3 seconds, and 5 nano-seconds
A new Timestamp
can be created from Integer
, Float
, String
, and Hash
values. Several variants of the constructor are provided.
Timestamp from seconds since epoch (1970-01-01 00:00:00 UTC)
When a Float is used, the decimal part represents fractions of a second.
function Timestamp.new(
Variant[Float, Integer] $value
)
Timestamp from String and patterns consisting of format directives
The first argument is parsed using the format optionally passed as a string or array of strings. When an array is used, an attempt will be made to parse the string using the first entry and then with each entry in succession until parsing succeeds. If the second argument is omitted, an array of default formats will be used.
A third optional timezone argument can be provided. The first argument will then be parsed as if it represents a local time in that timezone. The timezone can be any timezone that is recognized when using the ‘%z’ or ‘%Z’ formats, or the word ‘current’, in which case the current timezone of the evaluating process will be used. The timezone argument is case insensitive.
The default timezone, when no argument is provided, or when using the keyword default
, is ‘UTC’.
It is illegal to provide a timezone argument other than default
in combination with a format that contains ‘%z’ or ‘%Z’ since
that would introduce an ambiguity as to which timezone to use. The one extracted from the string, or the one provided as an argument.
An exception is raised when no format was able to parse the given string.
function Timestamp.new(
String $string,
Variant[String[2],Array[String[2], 1]] $format = <default format>,
String $timezone = default)
)
the arguments may also be passed as a Hash
:
function Timestamp.new(
Struct[{
string => String[1],
Optional[format] => Variant[String[2],Array[String[2], 1]],
Optional[timezone] => String[1]
}] $hash
)
The directive consists of a percent (%) character, zero or more flags, optional minimum field width and a conversion specifier as follows:
%[Flags][Width]Conversion
Flag | Meaning |
---|---|
- | Don’t pad numerical output |
_ | Use spaces for padding |
0 | Use zeros for padding |
# | Change names to upper-case or change case of am/pm |
^ | Use uppercase |
: | Use colons for %z |
Date (Year, Month, Day):
Format | Meaning |
---|---|
Y | Year with century, zero-padded to at least 4 digits |
C | year / 100 (rounded down such as 20 in 2009) |
y | year % 100 (00..99) |
m | Month of the year, zero-padded (01..12) |
B | The full month name (“January”) |
b | The abbreviated month name (“Jan”) |
h | Equivalent to %b |
d | Day of the month, zero-padded (01..31) |
e | Day of the month, blank-padded ( 1..31) |
j | Day of the year (001..366) |
Time (Hour, Minute, Second, Subsecond):
Format | Meaning |
---|---|
H | Hour of the day, 24-hour clock, zero-padded (00..23) |
k | Hour of the day, 24-hour clock, blank-padded ( 0..23) |
I | Hour of the day, 12-hour clock, zero-padded (01..12) |
l | Hour of the day, 12-hour clock, blank-padded ( 1..12) |
P | Meridian indicator, lowercase (“am” or “pm”) |
p | Meridian indicator, uppercase (“AM” or “PM”) |
M | Minute of the hour (00..59) |
S | Second of the minute (00..60) |
L | Millisecond of the second (000..999). Digits under millisecond are truncated to not produce 1000 |
N | Fractional seconds digits, default is 9 digits (nanosecond). Digits under a specified width are truncated to avoid carry up |
Time (Hour, Minute, Second, Subsecond):
Format | Meaning |
---|---|
z | Time zone as hour and minute offset from UTC (e.g. +0900) |
:z | hour and minute offset from UTC with a colon (e.g. +09:00) |
::z | hour, minute and second offset from UTC (e.g. +09:00:00) |
Z | Abbreviated time zone name or similar information. (OS dependent) |
Weekday:
Format | Meaning |
---|---|
A | The full weekday name (“Sunday”) |
a | The abbreviated name (“Sun”) |
u | Day of the week (Monday is 1, 1..7) |
w | Day of the week (Sunday is 0, 0..6) |
ISO 8601 week-based year and week number:
The first week of YYYY starts with a Monday and includes YYYY-01-04. The days in the year before the first week are in the last week of the previous year.
Format | Meaning |
---|---|
G | The week-based year |
g | The last 2 digits of the week-based year (00..99) |
V | Week number of the week-based year (01..53) |
Week number:
The first week of YYYY that starts with a Sunday or Monday (according to %U or %W). The days in the year before the first week are in week 0.
Format | Meaning |
---|---|
U | Week number of the year. The week starts with Sunday. (00..53) |
W | Week number of the year. The week starts with Monday. (00..53) |
Seconds since the Epoch:
Format | Meaning |
s | Number of seconds since 1970-01-01 00:00:00 UTC. |
Literal string:
Format | Meaning |
---|---|
n | Newline character (\n) |
t | Tab character (\t) |
% | Literal “%” character |
Combination:
Format | Meaning |
---|---|
c | date and time (%a %b %e %T %Y) |
D | Date (%m/%d/%y) |
F | The ISO 8601 date format (%Y-%m-%d) |
v | VMS date (%e-%^b-%4Y) |
x | Same as %D |
X | Same as %T |
r | 12-hour time (%I:%M:%S %p) |
R | 24-hour time (%H:%M) |
T | 24-hour time (%H:%M:%S) |
The default array contains the following patterns:
When a timezone argument (other than default
) is explicitly provided:
['%FT%T.L', '%FT%T', '%F']
otherwise:
['%FT%T.%L %Z', '%FT%T %Z', '%F %Z', '%FT%T.L', '%FT%T', '%F']
Examples - Converting to Timestamp
$ts = Timestamp(1473150899) # 2016-09-06 08:34:59 UTC
$ts = Timestamp({string=>'2015', format=>'%Y'}) # 2015-01-01 00:00:00.000 UTC
$ts = Timestamp('Wed Aug 24 12:13:14 2016', '%c') # 2016-08-24 12:13:14 UTC
$ts = Timestamp('Wed Aug 24 12:13:14 2016 PDT', '%c %Z') # 2016-08-24 19:13:14.000 UTC
$ts = Timestamp('2016-08-24 12:13:14', '%F %T', 'PST') # 2016-08-24 20:13:14.000 UTC
$ts = Timestamp('2016-08-24T12:13:14', default, 'PST') # 2016-08-24 20:13:14.000 UTC
A new Type
can be created from its String
representation.
$t = Type.new('Integer[10]')
Conversion to String
is the most comprehensive conversion as there are many use cases where a string representation is
wanted. The defaults for the many options have been chosen with care to be the most basic “value in textual form” representation. The more
advanced forms of formatting are intended to enable writing special purposes formatting functions in the Puppet language.
A new string can be created from all other data types. The process is performed in several steps - first the data type of the given value is inferred, then the resulting data type is used to find the most significant format specified for that data type. And finally, the found format is used to convert the given value.
The mapping from data type to format is referred to as the format map. This map allows different formatting depending on type.
$format_map = {
Integer[default, 0] => "%d",
Integer[1, default] => "%#x"
}
String("-1", $format_map) # produces '-1'
String("10", $format_map) # produces '0xa'
A format is specified on the form:
%[Flags][Width][.Precision]Format
Width
is the number of characters into which the value should be fitted. This allocated space is padded if value is shorter.
By default it is space padded, and the flag 0
will cause padding with 0
for numerical formats.
Precision
is the number of fractional digits to show for floating point, and the maximum characters included in a string
format.
Note that all data type supports the formats s
and p
with the meaning “default string representation” and
“default programmatic string representation” (which for example means that a String is quoted in ‘p’ format).
Signatures of String conversion
type Format = Pattern[/^%([\s\+\-#0\[\{<\(\|]*)([1-9][0-9]*)?(?:\.([0-9]+))?([a-zA-Z])/]
type ContainerFormat = Struct[{
format => Optional[String],
separator => Optional[String],
separator2 => Optional[String],
string_formats => Hash[Type, Format]
}]
type TypeMap = Hash[Type, Variant[Format, ContainerFormat]]
type Formats = Variant[Default, String[1], TypeMap]
function String.new(
Any $value,
Formats $string_formats
)
Where:
separator
is the string used to separate entries in an array, or hash (extra space should not be included at the end),
defaults to ","
separator2
is the separator between key and value in a hash entry (space padding should be included as wanted), defaults
to " => "
.string_formats
is a data type to format map for values contained in arrays and hashes - defaults to {Any =>
"%p"}
. Note that these nested formats are not applicable to data types that are containers; they are always formatted as per the top
level format specification.$str = String(10) # produces '10'
$str = String([10]) # produces '["10"]'
$str = String(10, "%#x") # produces '0x10'
$str = String([10], "%(a") # produces '("10")'
$formats = {
Array => {
format => '%(a',
string_formats => { Integer => '%#x' }
}
}
$str = String([1,2,3], $formats) # produces '(0x1, 0x2, 0x3)'
The given formats are merged with the default formats, and matching of values to convert against format is based on the specificity of the mapped type; for example, different formats can be used for short and long arrays.
Integer to String
Format | Integer Formats |
---|---|
d | Decimal, negative values produces leading ‘-‘. |
x X | Hexadecimal in lower or upper case. Uses ..f/..F for negative values unless + is also used. A # adds prefix
0x/0X. |
o | Octal. Uses ..0 for negative values unless + is also used. A # adds prefix 0. |
b B | Binary with prefix ‘b’ or ‘B’. Uses ..1/..1 for negative values unless + is also used. |
c | Numeric value representing a Unicode value, result is a one unicode character string, quoted if alternative flag # is used |
s | Same as d, or d in quotes if alternative flag # is used. |
p | Same as d. |
eEfgGaA | Converts integer to float and formats using the floating point rules. |
Defaults to d
.
Float to String
Format | Float formats |
---|---|
f | Floating point in non exponential notation. |
e E | Exponential notation with ‘e’ or ‘E’. |
g G | Conditional exponential with ‘e’ or ‘E’ if exponent < -4 or >= the precision. |
a A | Hexadecimal exponential form, using ‘x’/’X’ as prefix and ‘p’/’P’ before exponent. |
s | Converted to string using format p, then applying string formatting rule, alternate form # quotes result. |
p | Same as f format with minimum significant number of fractional digits, prec has no effect. |
dxXobBc | Converts float to integer and formats using the integer rules. |
Defaults to p
.
String to String
Format | String |
---|---|
s | Unquoted string, verbatim output of control chars. |
p | Programmatic representation - strings are quoted, interior quotes and control chars are escaped. Selects single or double quotes
based on content, or uses double quotes if alternative flag # is used. |
C | Each :: name segment capitalized, quoted if alternative flag # is used. |
c | Capitalized string, quoted if alternative flag # is used. |
d | Downcased string, quoted if alternative flag # is used. |
u | Upcased string, quoted if alternative flag # is used. |
t | Trims leading and trailing whitespace from the string, quoted if alternative flag # is used. |
Defaults to s
at top level and p
inside array or hash.
Boolean to String
Format | Boolean Formats |
---|---|
t T | String ‘true’/’false’ or ‘True’/’False’, first char if alternate form is used (i.e. ‘t’/’f’ or ‘T’/’F’). |
y Y | String ‘yes’/’no’, ‘Yes’/’No’, ‘y’/’n’ or ‘Y’/’N’ if alternative flag # is used. |
dxXobB | Numeric value 0/1 in accordance with the given format which must be valid integer format. |
eEfgGaA | Numeric value 0.0/1.0 in accordance with the given float format and flags. |
s | String ‘true’ / ‘false’. |
p | String ‘true’ / ‘false’. |
Regexp to String
Format | Regexp Formats |
---|---|
s | No delimiters, quoted if alternative flag # is used. |
p | Delimiters / / . |
Undef to String
Format | Undef formats |
---|---|
s | Empty string, or quoted empty string if alternative flag # is used. |
p | String ‘undef’, or quoted ‘“undef”’ if alternative flag # is used. |
n | String ‘nil’, or ‘null’ if alternative flag # is used. |
dxXobB | String ‘NaN’. |
eEfgGaA | String ‘NaN’. |
v | String ‘n/a’. |
V | String ‘N/A’. |
u | String ‘undef’, or ‘undefined’ if alternative # flag is used. |
Default value to String
Format | Default formats |
---|---|
d D | String ‘default’ or ‘Default’, alternative form # causes value to be quoted. |
s | Same as d. |
p | Same as d. |
Binary value to String
Format | Default formats |
---|---|
s | binary as unquoted UTF-8 characters (errors if byte sequence is invalid UTF-8). Alternate form escapes non ascii bytes. |
p | ‘Binary(“ - ")' |
b | ‘ - ' - base64 string with newlines inserted |
B | ‘ - ' - base64 strict string (without newlines inserted) |
u | ‘ - ' - base64 urlsafe string |
t | ‘Binary’ - outputs the name of the type only |
T | ‘BINARY’ - output the name of the type in all caps only |
#
will quote the binary or base64 text output.%#s
allows invalid UTF-8 characters and outputs all non ascii bytes as hex escaped characters on the form
\\xHH
where H
is a hex digit.%p
format.Array & Tuple to String
Format | Array/Tuple Formats |
---|---|
a | Formats with [ ] delimiters and , , alternate form # indents nested arrays/hashes. |
s | Same as a. |
p | Same as a. |
See “Flags” <[({\|
for formatting of delimiters, and “Additional parameters for containers; Array and Hash” for more
information about options.
The alternate form flag #
will cause indentation of nested array or hash containers. If width is also set it is taken as the
maximum allowed length of a sequence of elements (not including delimiters). If this max length is exceeded, each element will be
indented.
Hash & Struct to String
Format | Hash/Struct Formats |
---|---|
h | Formats with { } delimiters, , element separator and ` => ` inner element separator unless overridden
by flags. |
s | Same as h. |
p | Same as h. |
a | Converts the hash to an array of [k,v] tuples and formats it using array rule(s). |
See “Flags” <[({\|
for formatting of delimiters, and “Additional parameters for containers; Array and Hash” for more
information about options.
The alternate form flag #
will format each hash key/value entry indented on a separate line.
Type to String
Format | Array/Tuple Formats |
---|---|
s | The same as p , quoted if alternative flag # is used. |
p | Outputs the type in string form as specified by the Puppet Language. |
Flags
Flag | Effect |
---|---|
(space) | A space instead of + for numeric output (- is shown), for containers skips delimiters. |
# | Alternate format; prefix 0x/0x, 0 (octal) and 0b/0B for binary, Floats force decimal ‘.’. For g/G keep trailing 0. |
+ | Show sign +/- depending on value’s sign, changes x, X, o, b, B format to not use 2’s complement form. |
- | Left justify the value in the given width. |
0 | Pad with 0 instead of space for widths larger than value. |
<[({| | Defines an enclosing pair <> [] () {} or | | when used with a container type. |
Accepts a single value as argument:
false
, all other float values are true
false
, all other integer values are true
true
if ‘true’, ‘yes’, ‘y’ (case independent compare)false
if ‘false’, ‘no’, ‘n’ (case independent compare)When given a single value as argument:
Hash
is converted to an array matching Array[Tuple[Any,Any], 1]
.Hash
becomes an empty array.Array
is simply returned.Iterable[T]
is turned into an array of T
instances.Binary
is converted to an Array[Integer[0,255]]
of byte valuesWhen given a second Boolean argument:
true
, a value that is not already an array is returned as a one element array.false
, (the default), converts the first argument as shown above.$arr = Array($value, true)
Conversion to a Tuple
works exactly as conversion to an Array
, only that the constructed array is asserted
against the given tuple type.
Accepts a single value as argument:
Array
becomes an empty Hash
Array
matching Array[Tuple[Any,Any], 1]
is converted to a hash where each tuple describes a key/value
entryArray
with an even number of entries is interpreted as [key1, val1, key2, val2, ...]
Iterable
is turned into an Array
and then converted to hash as per the array rulesHash
is simply returnedAlternatively, a tree can be constructed by giving two values; an array of tuples on the form [path, value]
(where the
path
is the path from the root of a tree, and value
the value at that position in the tree), and either the option
'tree'
(do not convert arrays to hashes except the top level), or 'hash_tree'
(convert all arrays to hashes).
The tree/hash_tree forms of Hash creation are suited for transforming the result of an iteration using tree_each
and
subsequent filtering or mapping.
Mapping an arbitrary structure in a way that keeps the structure, but where some values are replaced can be done by using the
tree_each
function, mapping, and then constructing a new Hash from the result:
# A hash tree with 'water' at different locations
$h = { a => { b => { x => 'water'}}, b => { y => 'water'} }
# a helper function that turns water into wine
function make_wine($x) { if $x == 'water' { 'wine' } else { $x } }
# create a flattened tree with water turned into wine
$flat_tree = $h.tree_each.map |$entry| { [$entry[0], make_wine($entry[1])] }
# create a new Hash and log it
notice Hash($flat_tree, 'hash_tree')
Would notice the hash {a => {b => {x => wine}}, b => {y => wine}}
Conversion to a Struct
works exactly as conversion to a Hash
, only that the constructed hash is asserted against
the given struct type.
A String
can be converted into a Regexp
Example: Converting a String into a Regexp
$s = '[a-z]+\.com'
$r = Regexp($s)
if('foo.com' =~ $r) {
...
}
A SemVer object represents a single Semantic Version. It can be created from a String, individual values for its parts, or a hash specifying the value per part. See the specification at semver.org for the meaning of the SemVer’s parts.
The signatures are:
type PositiveInteger = Integer[0,default]
type SemVerQualifier = Pattern[/\A(?<part>[0-9A-Za-z-]+)(?:\.\g<part>)*\Z/]
type SemVerString = String[1]
type SemVerHash =Struct[{
major => PositiveInteger,
minor => PositiveInteger,
patch => PositiveInteger,
Optional[prerelease] => SemVerQualifier,
Optional[build] => SemVerQualifier
}]
function SemVer.new(SemVerString $str)
function SemVer.new(
PositiveInteger $major
PositiveInteger $minor
PositiveInteger $patch
Optional[SemVerQualifier] $prerelease = undef
Optional[SemVerQualifier] $build = undef
)
function SemVer.new(SemVerHash $hash_args)
# As a type, SemVer can describe disjunct ranges which versions can be
# matched against - here the type is constructed with two
# SemVerRange objects.
#
$t = SemVer[
SemVerRange('>=1.0.0 <2.0.0'),
SemVerRange('>=3.0.0 <4.0.0')
]
notice(SemVer('1.2.3') =~ $t) # true
notice(SemVer('2.3.4') =~ $t) # false
notice(SemVer('3.4.5') =~ $t) # true
A SemVerRange
object represents a range of SemVer
. It can be created from a String
, or from two
SemVer
instances, where either end can be given as a literal default
to indicate infinity. The string format of a
SemVerRange
is specified by the Semantic Version Range Grammar.
Use of the comparator sets described in the grammar (joining with
||
) is not supported.
The signatures are:
type SemVerRangeString = String[1]
type SemVerRangeHash = Struct[{
min => Variant[Default, SemVer],
Optional[max] => Variant[Default, SemVer],
Optional[exclude_max] => Boolean
}]
function SemVerRange.new(
SemVerRangeString $semver_range_string
)
function SemVerRange.new(
Variant[Default,SemVer] $min
Variant[Default,SemVer] $max
Optional[Boolean] $exclude_max = undef
)
function SemVerRange.new(
SemVerRangeHash $semver_range_hash
)
For examples of SemVerRange
use see “Creating a SemVer”
A Binary
object represents a sequence of bytes and it can be created from a String in Base64 format, an Array containing byte
values. A Binary can also be created from a Hash containing the value to convert to a Binary
.
The signatures are:
type ByteInteger = Integer[0,255]
type Base64Format = Enum["%b", "%u", "%B", "%s"]
type StringHash = Struct[{value => String, "format" => Optional[Base64Format]}]
type ArrayHash = Struct[{value => Array[ByteInteger]}]
type BinaryArgsHash = Variant[StringHash, ArrayHash]
function Binary.new(
String $base64_str,
Optional[Base64Format] $format
)
function Binary.new(
Array[ByteInteger] $byte_array
}
# Same as for String, or for Array, but where arguments are given in a Hash.
function Binary.new(BinaryArgsHash $hash_args)
The formats have the following meaning:
format | explanation |
---|---|
B | The data is in base64 strict encoding |
u | The data is in URL safe base64 encoding |
b | The data is in base64 encoding, padding as required by base64 strict, is added by default |
s | The data is a puppet string. The string must be valid UTF-8, or convertible to UTF-8 or an error is raised. |
r | (Ruby Raw) the byte sequence in the given string is used verbatim irrespective of possible encoding errors |
%B
.%r
should be used sparingly, or not at all. It exists for backwards compatibility reasons when
someone receiving a string from some function and that string should be treated as Binary. Such code should be changed to return a Binary
instead of a String.# create the binary content "abc"
$a = Binary('YWJj')
# create the binary content from content in a module's file
$b = binary_file('mymodule/mypicture.jpg')
Type
using the Init
typeThe type Init[T]
describes a value that can be used when instantiating a type. When used as the first argument in a call to
new
, it will dispatch the call to its contained type and optionally augment the parameter list with additional arguments.
# The following declaration
$x = Init[Integer].new('128')
# is exactly the same as
$x = Integer.new('128')
or, with base 16 and using implicit new
# The following declaration
$x = Init[Integer,16]('80')
# is exactly the same as
$x = Integer('80', 16)
$fmt = Init[String,'%#x']
notice($fmt(256)) # will notice '0x100'
new(Type $type, Any *$args, Optional[Callable] &$block)
next
Makes iteration continue with the next value, optionally with a given value for this iteration. If a value is not given it defaults to
undef
next(Optional[Any] $value)
notice
Logs a message on the server at level notice
.
notice(Any *$values)
*values
— The values to log.Return type(s): Undef
.
partition
Returns two arrays, the first containing the elements of enum for which the block evaluates to true, the second containing the rest.
Signature 1
partition(Collection $collection, Callable[1,1] &$block)
collection
— A collection of things to partition.Return type(s): Tuple[Array, Array]
.
Partition array of empty strings, results in e.g. [[’’], [b, c]]
[’’, b, c].partition | $s | { $s.empty } |
Partition array of strings using index, results in e.g. [[’’, ‘ab’], [‘b’]]
[’’, b, ab].partition | $i, $s | { $i == 2 or $s.empty } |
Partition hash of strings by key-value pair, results in e.g. [[[‘b’, []]], [[‘a’, [1, 2]]]]
{ a => [1, 2], b => [] }.partition | $kv | { $kv[1].empty } |
Partition hash of strings by key and value, results in e.g. [[[‘b’, []]], [[‘a’, [1, 2]]]]
{ a => [1, 2], b => [] }.partition | $k, $v | { $v.empty } |
Signature 2
partition(Array $array, Callable[2,2] &$block)
Signature 3
partition(Collection $collection, Callable[2,2] &$block)
realize
Make a virtual object real. This is useful when you want to know the name of the virtual object and don’t want to bother with a full
collection. It is slightly faster than a collection, and, of course, is a bit shorter. You must pass the object using a reference; e.g.:
realize User[luke]
.
realize()
reduce
Applies a lambda to every value in a data structure from the first argument, carrying over the returned value of each iteration, and returns the result of the lambda’s final iteration. This lets you create a new value or data structure by combining values from the first argument’s data structure.
This function takes two mandatory arguments, in this order:
$data.reduce |$memo, $value| { ... }
or
reduce($data) |$memo, $value| { ... }
You can also pass an optional “start memo” value as an argument, such as start
below:
$data.reduce(start) |$memo, $value| { ... }
or
reduce($data, start) |$memo, $value| { ... }
When the first argument ($data
in the above example) is an array, Puppet passes each of the data structure’s values in turn
to the lambda’s parameters. When the first argument is a hash, Puppet converts each of the hash’s values to an array in the form [key,
value]
.
If you pass a start memo value, Puppet executes the lambda with the provided memo value and the data structure’s first value. Otherwise, Puppet passes the structure’s first two values to the lambda.
Puppet calls the lambda for each of the data structure’s remaining values. For each call, it passes the result of the previous call as the
first parameter ($memo
in the above examples) and the next value from the data structure as the second parameter
($value
).
# Reduce the array $data, returning the sum of all values in the array.
$data = [1, 2, 3]
$sum = $data.reduce |$memo, $value| { $memo + $value }
# $sum contains 6
# Reduce the array $data, returning the sum of a start memo value and all values in the
# array.
$data = [1, 2, 3]
$sum = $data.reduce(4) |$memo, $value| { $memo + $value }
# $sum contains 10
# Reduce the hash $data, returning the sum of all values and concatenated string of all
# keys.
$data = {a => 1, b => 2, c => 3}
$combine = $data.reduce |$memo, $value| {
$string = "${memo[0]}${value[0]}"
$number = $memo[1] + $value[1]
[$string, $number]
}
# $combine contains [abc, 6]
# Reduce the array $data, returning the sum of all values in the array and starting
# with $memo set to an arbitrary value instead of $data's first value.
$data = [1, 2, 3]
$sum = $data.reduce(4) |$memo, $value| { $memo + $value }
# At the start of the lambda's first iteration, $memo contains 4 and $value contains 1.
# After all iterations, $sum contains 10.
# Reduce the hash $data, returning the sum of all values and concatenated string of
# all keys, and starting with $memo set to an arbitrary array instead of $data's first
# key-value pair.
$data = {a => 1, b => 2, c => 3}
$combine = $data.reduce( [d, 4] ) |$memo, $value| {
$string = "${memo[0]}${value[0]}"
$number = $memo[1] + $value[1]
[$string, $number]
}
# At the start of the lambda's first iteration, $memo contains [d, 4] and $value
# contains [a, 1].
# $combine contains [dabc, 10]
# Reduce a hash of hashes $data, merging defaults into the inner hashes.
$data = {
'connection1' => {
'username' => 'user1',
'password' => 'pass1',
},
'connection_name2' => {
'username' => 'user2',
'password' => 'pass2',
},
}
$defaults = {
'maxActive' => '20',
'maxWait' => '10000',
'username' => 'defaultuser',
'password' => 'defaultpass',
}
$merged = $data.reduce( {} ) |$memo, $x| {
$memo + { $x[0] => $defaults + $data[$x[0]] }
}
# At the start of the lambda's first iteration, $memo is set to {}, and $x is set to
# the first [key, value] tuple. The key in $data is, therefore, given by $x[0]. In
# subsequent rounds, $memo retains the value returned by the expression, i.e.
# $memo + { $x[0] => $defaults + $data[$x[0]] }.
Signature 1
reduce(Iterable $enumerable, Callable[2,2] &$block)
Signature 2
reduce(Iterable $enumerable, Any $memo, Callable[2,2] &$block)
regsubst
Performs regexp replacement on a string or array of strings.
Signature 1
regsubst(Variant[Array[String],String] $target, String $pattern, Variant[String,Hash[String,String]] $replacement,
Optional[Optional[Pattern[/^[GEIM]*$/]]] $flags, Optional[Enum['N','E','S','U']] $encoding)
target
— The string or array of strings to operate on. If an array, the replacement will be performed on each of the
elements in the array, and the return value will be an array.
pattern
— The regular expression matching the target string. If you want it anchored at the start and or end of the
string, you must do that with ^ and $ yourself.
replacement
— Replacement string. Can contain backreferences to what was matched using \0 (whole match), \1 (first set of
parentheses), and so on. If the second argument is a Hash, and the matched text is one of its keys, the corresponding value is the
replacement string.
flags
— Optional. String of single letter flags for how the regexp is interpreted (E, I, and M cannot be used if pattern is
a precompiled regexp):
encoding
— Optional. How to handle multibyte characters when compiling the regexp (must not be used when pattern is a
precompiled regexp). A single-character string with the following values:
Return type(s): Array[String]
, String
. The result of the substitution. Result type is the same as for the target
parameter.
Get the third octet from the node’s IP address:
$i3 = regsubst($ipaddress,'^(\\d+)\\.(\\d+)\\.(\\d+)\\.(\\d+)$','\\3')
Signature 2
regsubst(Variant[Array[String],String] $target, Variant[Regexp,Type[Regexp]] $pattern, Variant[String,Hash[String,String]]
$replacement, Optional[Pattern[/^G?$/]] $flags)
target
— The string or array of strings to operate on. If an array, the replacement will be performed on each of the
elements in the array, and the return value will be an array.
pattern
— The regular expression matching the target string. If you want it anchored at the start and or end of the
string, you must do that with ^ and $ yourself.
replacement
— Replacement string. Can contain backreferences to what was matched using \0 (whole match), \1 (first set of
parentheses), and so on. If the second argument is a Hash, and the matched text is one of its keys, the corresponding value is the
replacement string.
flags
— Optional. String of single letter flags for how the regexp is interpreted (E, I, and M cannot be used if pattern is
a precompiled regexp):
encoding
— Optional. How to handle multibyte characters when compiling the regexp (must not be used when pattern is a
precompiled regexp). A single-character string with the following values:
Return type(s): Array[String]
, String
. The result of the substitution. Result type is the same as for the target
parameter.
Put angle brackets around each octet in the node’s IP address:
$x = regsubst($ipaddress, /([0-9]+)/, '<\\1>', 'G')
require
Requires the specified classes. Evaluate one or more classes, adding the required class as a dependency.
The relationship metaparameters work well for specifying relationships between individual resources, but they can be clumsy for specifying relationships between classes. This function is a superset of the ‘include’ function, adding a class relationship so that the requiring class depends on the required class.
Warning: using require in place of include can lead to unwanted dependency cycles.
For instance the following manifest, with ‘require’ instead of ‘include’ would produce a nasty dependence cycle, because notify imposes a before between File[/foo] and Service[foo]:
class myservice {
service { foo: ensure => running }
}
class otherstuff {
include myservice
file { '/foo': notify => Service[foo] }
}
Note that this function only works with clients 0.25 and later, and it will fail if used with earlier clients.
You must use the class’s full name; relative names are not allowed. In addition to names in string form, you may also directly use Class and Resource Type values that are produced when evaluating resource and relationship expressions.
require(Any *$names)
return
Makes iteration continue with the next value, optionally with a given value for this iteration. If a value is not given it defaults to
undef
return(Optional[Any] $value)
reverse_each
Reverses the order of the elements of something that is iterable and optionally runs a lambda for each element.
This function takes one to two arguments:
Iterable
that the function will iterate over.$data.reverse_each |$parameter| { <PUPPET CODE BLOCK> }
or
$reverse_data = $data.reverse_each
or
reverse_each($data) |$parameter| { <PUPPET CODE BLOCK> }
or
$reverse_data = reverse_each($data)
When no second argument is present, Puppet returns an Iterable
that represents the reverse order of its first argument. This
allows methods on Iterable
to be chained.
When a lambda is given as the second argument, Puppet iterates the first argument in reverse order and passes each value in turn to the
lambda, then returns undef
.
# Puppet will log a notice for each of the three items
# in $data in reverse order.
$data = [1,2,3]
$data.reverse_each |$item| { notice($item) }
When no second argument is present, Puppet returns a new Iterable
which allows it to be directly chained into another
function that takes an Iterable
as an argument.
# For the array $data, return an array containing each
# value multiplied by 10 in reverse order
$data = [1,2,3]
$transformed_data = $data.reverse_each.map |$item| { $item * 10 }
# $transformed_data is set to [30,20,10]
# For the array $data, return an array containing each
# value multiplied by 10 in reverse order
$data = [1,2,3]
$transformed_data = map(reverse_each($data)) |$item| { $item * 10 }
# $transformed_data is set to [30,20,10]
Signature 1
reverse_each(Iterable $iterable)
Signature 2
reverse_each(Iterable $iterable, Callable[1,1] &$block)
round
Returns an Integer
value rounded to the nearest value. Takes a single Numeric
value as an argument.
notice(round(2.9)) # would notice 3
notice(round(2.1)) # would notice 2
notice(round(-2.9)) # would notice -3
round(Numeric $val)
rstrip
Strips trailing spaces from a String
This function is compatible with the stdlib function with the same name.
The function does the following:
String
the conversion removes all trailing ASCII white space characters such as space, tab, newline, and return. It
does not remove other space-like characters like hard space (Unicode U+00A0). (Tip, /^[[:space:]]/
regular expression matches
all space-like characters).Iterable[Variant[String, Numeric]]
(for example an Array
) each value is processed and the conversion
is not recursive.Numeric
it is simply returned (this is for backwards compatibility)."hello\n\t".lstrip()
camelcase("hello\n\t")
Would both result in "hello"
["hello\n\t", "hi\n\t"].lstrip()
lstrip(["hello\n\t", "hi\n\t"])
Would both result in ['hello', 'hi']
Signature 1
rstrip(Numeric $arg)
Signature 2
rstrip(String $arg)
Signature 3
rstrip(Iterable[Variant[String, Numeric]] $arg)
scanf
Scans a string and returns an array of one or more converted values based on the given format string. See the documentation of Ruby’s
String#scanf method for details about the supported formats (which are similar but not identical to the formats used in Puppet’s
sprintf
function.)
This function takes two mandatory arguments: the first is the string to convert, and the second is the format string. The result of the scan is an array, with each successfully scanned and transformed value. The scanning stops if a scan is unsuccessful, and the scanned result up to that point is returned. If there was no successful scan, the result is an empty array.
“42”.scanf(“%i”)
You can also optionally pass a lambda to scanf, to do additional validation or processing.
"42".scanf("%i") |$x| {
unless $x[0] =~ Integer {
fail "Expected a well formed integer value, got '$x[0]'"
}
$x[0]
}
scanf(String $data, String $format, Optional[Callable] &$block)
sha1
Returns a SHA1 hash value from a provided string.
sha1()
sha256
Returns a SHA256 hash value from a provided string.
sha256()
shellquote
\ Quote and concatenate arguments for use in Bourne shell.
Each argument is quoted separately, and then all are concatenated with spaces. If an argument is an array, the elements of that array is interpolated within the rest of the arguments; this makes it possible to have an array of arguments and pass that array to shellquote instead of having to specify each argument individually in the call.
shellquote()
size
The same as length() - returns the size of an Array, Hash, String, or Binary value.
size(Variant[Collection, String, Binary] $arg)
slice
Slices an array or hash into pieces of a given size.
This function takes two mandatory arguments: the first should be an array or hash, and the second specifies the number of elements to include in each slice.
When the first argument is a hash, each key value pair is counted as one. For example, a slice size of 2 will produce an array of two arrays with key, and value.
$a.slice(2) |$entry| { notice "first ${$entry[0]}, second ${$entry[1]}" }
$a.slice(2) |$first, $second| { notice "first ${first}, second ${second}" }
The function produces a concatenated result of the slices.
slice([1,2,3,4,5,6], 2) # produces [[1,2], [3,4], [5,6]]
slice(Integer[1,6], 2) # produces [[1,2], [3,4], [5,6]]
slice(4,2) # produces [[0,1], [2,3]]
slice('hello',2) # produces [[h, e], [l, l], [o]]
$a.slice($n) |$x| { ... }
slice($a) |$x| { ... }
The lambda should have either one parameter (receiving an array with the slice), or the same number of parameters as specified by the slice size (each parameter receiving its part of the slice). If there are fewer remaining elements than the slice size for the last slice, it will contain the remaining elements. If the lambda has multiple parameters, excess parameters are set to undef for an array, or to empty arrays for a hash.
$a.slice(2) |$first, $second| { ... }
Signature 1
slice(Hash[Any, Any] $hash, Integer[1, default] $slice_size, Optional[Callable] &$block)
Signature 2
slice(Iterable $enumerable, Integer[1, default] $slice_size, Optional[Callable] &$block)
sort
Sorts an Array numerically or lexicographically or the characters of a String lexicographically. Please note: This function is based on Ruby String comparison and as such may not be entirely UTF8 compatible. To ensure compatibility please use this function with Ruby 2.4.0 or greater - https://bugs.ruby-lang.org/issues/10085.
This function is compatible with the function sort() in stdlib.
compare($a,$b)
to ignore case)Also see the compare()
function for information about comparable data types in general.
notice(sort("xadb")) # notices 'abdx'
notice(sort([3,6,2])) # notices [2, 3, 6]
notice(sort([3,6,2]) |$a,$b| { compare($a, $b) }) # notices [2, 3, 6]
notice(sort([3,6,2]) |$a,$b| { compare($b, $a) }) # notices [6, 3, 2]
notice(sort(['A','b','C'])) # notices ['A', 'C', 'b']
notice(sort(['A','b','C']) |$a,$b| { compare($a, $b) }) # notices ['A', 'b', 'C']
notice(sort(['A','b','C']) |$a,$b| { compare($a, $b, true) }) # notices ['A', 'b', 'C']
notice(sort(['A','b','C']) |$a,$b| { compare($a, $b, false) }) # notices ['A','C', 'b']
notice(sort(['b', 3, 'a', 2]) |$a, $b| {
case [$a, $b] {
[String, Numeric] : { 1 }
[Numeric, String] : { -1 }
default: { compare($a, $b) }
}
})
Would notice [2,3,’a’,’b’]
Signature 1
sort(String $string_value, Optional[Callable[2,2]] &$block)
Signature 2
sort(Array $array_value, Optional[Callable[2,2]] &$block)
split
Splits a string into an array using a given pattern. The pattern can be a string, regexp or regexp type.
$string = 'v1.v2:v3.v4'
$array_var1 = split($string, /:/)
$array_var2 = split($string, '[.]')
$array_var3 = split($string, Regexp['[.:]'])
#`$array_var1` now holds the result `['v1.v2', 'v3.v4']`,
# while `$array_var2` holds `['v1', 'v2:v3', 'v4']`, and
# `$array_var3` holds `['v1', 'v2', 'v3', 'v4']`.
Note that in the second example, we split on a literal string that contains a regexp meta-character (.
), which must be
escaped. A simple way to do that for a single character is to enclose it in square brackets; a backslash will also escape a single
character.
Signature 1
split(String $str, String $pattern)
Signature 2
split(String $str, Regexp $pattern)
Signature 3
split(String $str, Type[Regexp] $pattern)
sprintf
Perform printf-style formatting of text.
The first parameter is format string describing how the rest of the parameters should be formatted. See the documentation for the Kernel::sprintf
function in Ruby for details.
To use named format arguments, provide a hash containing the target string values as the argument to be formatted. For example:
notice sprintf(\"%<x>s : %<y>d\", { 'x' => 'value is', 'y' => 42 })
This statement produces a notice of value is : 42
.
sprintf()
step
When no block is given, Puppet returns a new Iterable
which allows it to be directly chained into another function that takes
an Iterable
as an argument.
# For the array $data, return an array, set to the first element and each 5th successor element, in reverse
# order multiplied by 10
$data = Integer[0,20]
$transformed_data = $data.step(5).map |$item| { $item * 10 }
$transformed_data contains [0,50,100,150,200]
# For the array $data, return an array, set to the first and each 5th
# successor, in reverse order, multiplied by 10
$data = Integer[0,20]
$transformed_data = map(step($data, 5)) |$item| { $item * 10 }
$transformed_data contains [0,50,100,150,200]
Signature 1
step(Iterable $iterable, Integer[1] $step)
Signature 2
step(Iterable $iterable, Integer[1] $step, Callable[1,1] &$block)
strftime
Formats timestamp or timespan according to the directives in the given format string. The directives begins with a percent (%) character. Any text not listed as a directive will be passed through to the output string.
A third optional timezone argument can be provided. The first argument will then be formatted to represent a local time in that timezone. The timezone can be any timezone that is recognized when using the ‘%z’ or ‘%Z’ formats, or the word ‘current’, in which case the current timezone of the evaluating process will be used. The timezone argument is case insensitive.
The default timezone, when no argument is provided, or when using the keyword default
, is ‘UTC’.
The directive consists of a percent (%) character, zero or more flags, optional minimum field width and a conversion specifier as follows:
%[Flags][Width]Conversion
Flag | Meaning |
---|---|
- | Don’t pad numerical output |
_ | Use spaces for padding |
0 | Use zeros for padding |
Timestamp
specific flagsFlag | Meaning |
---|---|
# | Change case |
^ | Use uppercase |
: | Use colons for %z |
Timestamp
(names and padding can be altered using flags):Date (Year, Month, Day):
Format | Meaning |
---|---|
Y | Year with century, zero-padded to at least 4 digits |
C | year / 100 (rounded down such as 20 in 2009) |
y | year % 100 (00..99) |
m | Month of the year, zero-padded (01..12) |
B | The full month name (“January”) |
b | The abbreviated month name (“Jan”) |
h | Equivalent to %b |
d | Day of the month, zero-padded (01..31) |
e | Day of the month, blank-padded ( 1..31) |
j | Day of the year (001..366) |
Time (Hour, Minute, Second, Subsecond):
Format | Meaning |
---|---|
H | Hour of the day, 24-hour clock, zero-padded (00..23) |
k | Hour of the day, 24-hour clock, blank-padded ( 0..23) |
I | Hour of the day, 12-hour clock, zero-padded (01..12) |
l | Hour of the day, 12-hour clock, blank-padded ( 1..12) |
P | Meridian indicator, lowercase (“am” or “pm”) |
p | Meridian indicator, uppercase (“AM” or “PM”) |
M | Minute of the hour (00..59) |
S | Second of the minute (00..60) |
L | Millisecond of the second (000..999). Digits under millisecond are truncated to not produce 1000 |
N | Fractional seconds digits, default is 9 digits (nanosecond). Digits under a specified width are truncated to avoid carry up |
Time (Hour, Minute, Second, Subsecond):
Format | Meaning |
---|---|
z | Time zone as hour and minute offset from UTC (e.g. +0900) |
:z | hour and minute offset from UTC with a colon (e.g. +09:00) |
::z | hour, minute and second offset from UTC (e.g. +09:00:00) |
Z | Abbreviated time zone name or similar information. (OS dependent) |
Weekday:
Format | Meaning |
---|---|
A | The full weekday name (“Sunday”) |
a | The abbreviated name (“Sun”) |
u | Day of the week (Monday is 1, 1..7) |
w | Day of the week (Sunday is 0, 0..6) |
ISO 8601 week-based year and week number:
The first week of YYYY starts with a Monday and includes YYYY-01-04. The days in the year before the first week are in the last week of the previous year.
Format | Meaning |
---|---|
G | The week-based year |
g | The last 2 digits of the week-based year (00..99) |
V | Week number of the week-based year (01..53) |
Week number:
The first week of YYYY that starts with a Sunday or Monday (according to %U or %W). The days in the year before the first week are in week 0.
Format | Meaning |
---|---|
U | Week number of the year. The week starts with Sunday. (00..53) |
W | Week number of the year. The week starts with Monday. (00..53) |
Seconds since the Epoch:
Format | Meaning |
s | Number of seconds since 1970-01-01 00:00:00 UTC. |
Literal string:
Format | Meaning |
---|---|
n | Newline character (\n) |
t | Tab character (\t) |
% | Literal “%” character |
Combination:
Format | Meaning |
---|---|
c | date and time (%a %b %e %T %Y) |
D | Date (%m/%d/%y) |
F | The ISO 8601 date format (%Y-%m-%d) |
v | VMS date (%e-%^b-%4Y) |
x | Same as %D |
X | Same as %T |
r | 12-hour time (%I:%M:%S %p) |
R | 24-hour time (%H:%M) |
T | 24-hour time (%H:%M:%S) |
$timestamp = Timestamp('2016-08-24T12:13:14')
# Notice the timestamp using a format that notices the ISO 8601 date format
notice($timestamp.strftime('%F')) # outputs '2016-08-24'
# Notice the timestamp using a format that notices weekday, month, day, time (as UTC), and year
notice($timestamp.strftime('%c')) # outputs 'Wed Aug 24 12:13:14 2016'
# Notice the timestamp using a specific timezone
notice($timestamp.strftime('%F %T %z', 'PST')) # outputs '2016-08-24 04:13:14 -0800'
# Notice the timestamp using timezone that is current for the evaluating process
notice($timestamp.strftime('%F %T', 'current')) # outputs the timestamp using the timezone for the current process
Timespan
:Format | Meaning |
---|---|
D | Number of Days |
H | Hour of the day, 24-hour clock |
M | Minute of the hour (00..59) |
S | Second of the minute (00..59) |
L | Millisecond of the second (000..999). Digits under millisecond are truncated to not produce 1000. |
N | Fractional seconds digits, default is 9 digits (nanosecond). Digits under a specified length are truncated to avoid carry up |
The format directive that represents the highest magnitude in the format will be allowed to overflow. I.e. if no “%D” is used but a “%H” is present, then the hours will be more than 23 in case the timespan reflects more than a day.
$duration = Timespan({ hours => 3, minutes => 20, seconds => 30 })
# Notice the duration using a format that outputs <hours>:<minutes>:<seconds>
notice($duration.strftime('%H:%M:%S')) # outputs '03:20:30'
# Notice the duration using a format that outputs <minutes>:<seconds>
notice($duration.strftime('%M:%S')) # outputs '200:30'
Signature 1
strftime(Timespan $time_object, String $format)
Signature 2
strftime(Timestamp $time_object, String $format, Optional[String] $timezone)
Signature 3
strftime(String $format, Optional[String] $timezone)
strip
Strips leading and trailing spaces from a String
This function is compatible with the stdlib function with the same name.
The function does the following:
String
the conversion removes all leading and trailing ASCII white space characters such as space, tab, newline, and
return. It does not remove other space-like characters like hard space (Unicode U+00A0). (Tip, /^[[:space:]]/
regular
expression matches all space-like characters).Iterable[Variant[String, Numeric]]
(for example an Array
) each value is processed and the conversion
is not recursive.Numeric
it is simply returned (this is for backwards compatibility)." hello\n\t".lstrip()
camelcase(" hello\n\t")
Would both result in "hello"
[" hello\n\t", " hi\n\t"].lstrip()
lstrip([" hello\n\t", " hi\n\t"])
Would both result in ['hello', 'hi']
Signature 1
strip(Numeric $arg)
Signature 2
strip(String $arg)
Signature 3
strip(Iterable[Variant[String, Numeric]] $arg)
tag
Add the specified tags to the containing class or definition. All contained objects will then acquire that tag, also.
tag()
tagged
A boolean function that tells you whether the current container is tagged with the specified tags. The tags are ANDed, so that all of the specified tags must be included for the function to return true.
tagged()
template
Loads an ERB template from a module, evaluates it, and returns the resulting value as a string.
The argument to this function should be a <MODULE NAME>/<TEMPLATE FILE>
reference, which will load
<TEMPLATE FILE>
from a module’s templates
directory. (For example, the reference
apache/vhost.conf.erb
will load the file <MODULES DIRECTORY>/apache/templates/vhost.conf.erb
.)
This function can also accept:
template()
then
Calls a lambda with the given argument unless the argument is
undef
. Returns undef
if the argument is undef
, and otherwise the result of giving the argument to the
lambda.
This is useful to process a sequence of operations where an intermediate result may be undef
(which makes the entire sequence
undef
). The then
function is especially useful with the function dig
which performs in a similar way
“digging out” a value in a complex structure.
$data = {a => { b => [{x => 10, y => 20}, {x => 100, y => 200}]}}
notice $data.dig(a, b, 1, x).then |$x| { $x * 2 }
Would notice the value 200
Contrast this with:
$data = {a => { b => [{x => 10, y => 20}, {not_x => 100, why => 200}]}}
notice $data.dig(a, b, 1, x).then |$x| { $x * 2 }
Which would notice undef
since the last lookup of ‘x’ results in undef
which is returned (without calling the
lambda given to the then
function).
As a result there is no need for conditional logic or a temporary (non local) variable as the result is now either the wanted value
(x
) multiplied by 2 or undef
.
Calls to then
can be chained. In the next example, a structure is using an offset based on using 1 as the index to the first
element (instead of 0 which is used in the language). We are not sure if user input actually contains an index at all, or if it is outside
the range of available names.args.
# Names to choose from
$names = ['Ringo', 'Paul', 'George', 'John']
# Structure where 'beatle 2' is wanted (but where the number refers
# to 'Paul' because input comes from a source using 1 for the first
# element).
$data = ['singer', { beatle => 2 }]
$picked = assert_type(String,
# the data we are interested in is the second in the array,
# a hash, where we want the value of the key 'beatle'
$data.dig(1, 'beatle')
# and we want the index in $names before the given index
.then |$x| { $names[$x-1] }
# so we can construct a string with that beatle's name
.then |$x| { "Picked Beatle '${x}'" }
)
notice $picked
Would notice “Picked Beatle ‘Paul’”, and would raise an error if the result was not a String.
then(Any $arg, Callable[1,1] &$block)
tree_each
Runs a lambda recursively and repeatedly using values from a data
structure, then returns the unchanged data structure, or if a lambda is not given, returns an Iterator
for the tree.
This function takes one mandatory argument, one optional, and an optional block in this order:
Array
, Hash
, Iterator
, or Object
that the function will iterate over.include_containers
=> Optional[Boolean]
# default true - if containers should be given to the
lambdainclude_values
=> Optional[Boolean]
# default true - if non containers should be given to the
lambdainclude_root
=> Optional[Boolean]
# default true - if the root container should be given to the
lambdacontainer_type
=> Optional[Type[Variant[Array, Hash, Object]]]
# a type that determines what a
container is - can only be set to a type that matches the default Variant[Array, Hash, Object]
.order
=> Enum[depth_first, breadth_first]
# default ´depth_first`, the order in which elements are
visitedinclude_refs
=> Optional[Boolean] # default false
, if attributes in objects marked as bing of
reference
kind should be included.$path
, and $value
, or just $value
.$data.tree_each |$path, $value| { <PUPPET CODE BLOCK> }
$data.tree_each |$value| { <PUPPET CODE BLOCK>
}
or
tree_each($data) |$path, $value| { <PUPPET CODE BLOCK> }
tree_each($data) |$value| { <PUPPET CODE BLOCK>
}
The parameter $path
is always given as an Array
containing the path that when applied to the tree as
$data.dig(*$path) yields the
$value. The
$value` is the value at that path.
For Array
values, the path will contain Integer
entries with the array index, and for Hash
values,
the path will contain the hash key, which may be Any
value. For Object
containers, the entry is the name of the
attribute (a String
).
The tree is walked in either depth-first order, or in breadth-first order under the control of the order
option, yielding
each Array
, Hash
, Object
, and each entry/attribute. The default is depth_first
which
means that children are processed before siblings. An order of breadth_first
means that siblings are processed before
children.
[1, [2, 3], 4]
Results in:
If containers are skipped:
depth_first
order 1
, 2
, 3
, 4
breadth_first
order 1
, 4
,2
, 3
If containers and root, are included:
depth_first
order [1, [2, 3], 4]
, 1
, [2, 3]
, 2
, 3
,
4
breadth_first
order [1, [2, 3], 4]
, 1
, [2, 3]
, 4
, 2
,
3
Typical use of the tree_each
function include:
flatten
on an array as that requires a new (potentially very
large) array to be created$data = [1, 2, [3, [4, 5]]]
$data.tree_each({include_containers => false}) |$v| { notice "$v" }
This would call the lambda 5 times with with the following values in sequence: 1
, 2
, 3
,
4
, 5
$data = [1, 2, [3, [4, 5]]]
$data.tree_each |$v| { notice "$v" }
This would call the lambda 7 times with the following values in sequence: 1
, 2
, [3, [4, 5]]
,
3
, [4, 5]
, 4
, 5
$data = [1, 2, [3, [4, 5]]]
$data.tree_each({include_values => false, include_root => false}) |$v| { notice "$v" }
This would call the lambda 2 times with the following values in sequence: [3, [4, 5]]
, [4, 5]
Any Puppet Type system data type can be used to filter what is considered to be a container, but it must be a narrower type than one of
the default Array, Hash, Object types - for example it is not possible to make a String
be a container type.
$data = [1, {a => 'hello', b => [100, 200]}, [3, [4, 5]]]
$data.tree_each({container_type => Array, include_containers => false} |$v| { notice "$v" }
Would call the lambda 5 times with 1
, {a => 'hello', b => [100, 200]}
, 3
, 4
,
5
Chaining When calling tree_each
without a lambda the function produces an Iterator
that can be
chained into another iteration. Thus it is easy to use one of:
reverse_each
- get “leaves before root”filter
- prune the treemap
- transform each elementreduce
- produce something elseNote than when chaining, the value passed on is a Tuple
with [path, value]
.
# A tree of some complexity (here very simple for readability)
$tree = [
{ name => 'user1', status => 'inactive', id => '10'},
{ name => 'user2', status => 'active', id => '20'}
]
notice $tree.tree_each.filter |$v| {
$value = $v[1]
$value =~ Hash and $value[status] == active
}
Would notice [[[1], {name => user2, status => active, id => 20}]]
, which can then be processed further as each
filtered result appears as a Tuple
with [path, value]
.
For general examples that demonstrates iteration see the Puppet iteration documentation.
Signature 1
tree_each(Variant[Iterator, Array, Hash, Object] $tree, Optional[OptionsType] $options, Callable[2,2] &$block)
Signature 2
tree_each(Variant[Iterator, Array, Hash, Object] $tree, Optional[OptionsType] $options, Callable[1,1] &$block)
Signature 3
tree_each(Variant[Iterator, Array, Hash, Object] $tree, Optional[OptionsType] $options)
type
Returns the data type of a given value with a given degree of generality.
type InferenceFidelity = Enum[generalized, reduced, detailed]
function type(Any $value, InferenceFidelity $fidelity = 'detailed') # returns Type
notice type(42) =~ Type[Integer]
Would notice true
.
By default, the best possible inference is made where all details are retained. This is good when the type is used for further type calculations but is overwhelmingly rich in information if it is used in a error message.
The optional argument $fidelity
may be given as (from lowest to highest fidelity):
generalized
- reduces to common type and drops size constraintsreduced
- reduces to common type in collectionsdetailed
- (default) all details about inferred types is retainednotice type([3.14, 42], 'generalized')
notice type([3.14, 42], 'reduced'')
notice type([3.14, 42], 'detailed')
notice type([3.14, 42])
Would notice the four values:
Signature 1
type(Any $value, Optional[Enum[detailed]] $inference_method)
Signature 2
type(Any $value, Enum[reduced] $inference_method)
Signature 3
type(Any $value, Enum[generalized] $inference_method)
unique
Produces a unique set of values from an Iterable
argument.
String
, the unique set of characters are returned as a new String
.Hash
, the resulting hash associates a set of keys with a set of unique values.Iterable
(Array
, Iterator
) the result is an Array
with a
unique set of entries.String
values are case sensitive.# will produce 'abc'
"abcaabb".unique
# will produce ['a', 'b', 'c']
['a', 'b', 'c', 'a', 'a', 'b'].unique
# will produce { ['a', 'b'] => [10], ['c'] => [20]}
{'a' => 10, 'b' => 10, 'c' => 20}.unique
# will produce { 'a' => 10, 'c' => 20 } (use first key with first value)
Hash.new({'a' => 10, 'b' => 10, 'c' => 20}.unique.map |$k, $v| { [ $k[0] , $v[0]] })
# will produce { 'b' => 10, 'c' => 20 } (use last key with first value)
Hash.new({'a' => 10, 'b' => 10, 'c' => 20}.unique.map |$k, $v| { [ $k[-1] , $v[0]] })
# will produce [3, 2, 1]
[1,2,2,3,3].reverse_each.unique
# will produce [['sam', 'smith'], ['sue', 'smith']]
[['sam', 'smith'], ['sam', 'brown'], ['sue', 'smith']].unique |$x| { $x[0] }
# will produce [['sam', 'smith'], ['sam', 'brown']]
[['sam', 'smith'], ['sam', 'brown'], ['sue', 'smith']].unique |$x| { $x[1] }
# will produce ['aBc', 'bbb'] (using a lambda to make comparison using downcased (%d) strings)
['aBc', 'AbC', 'bbb'].unique |$x| { String($x,'%d') }
# will produce {[a] => [10], [b, c, d, e] => [11, 12, 100]}
{a => 10, b => 11, c => 12, d => 100, e => 11}.unique |$v| { if $v > 10 { big } else { $v } }
Note that for Hash
the result is slightly different than for the other data types. For those the result contains the
first-found unique value, but for Hash
it contains associations from a set of keys to the set of values clustered by
the equality lambda (or the default value equality if no lambda was given). This makes the unique
function more versatile for
hashes in general, while requiring that the simple computation of “hash’s unique set of values” is performed as $hsh.map |$k, $v| { $v
}.unique
. (A unique set of hash keys is in general meaningless (since they are unique by definition) - although if processed with a
different lambda for equality that would be different. First map the hash to an array of its keys if such a unique computation is wanted). If
the more advanced clustering is wanted for one of the other data types, simply transform it into a Hash
as shown in the
following example.
# Array ['a', 'b', 'c'] to Hash with index results in
# {0 => 'a', 1 => 'b', 2 => 'c'}
Hash(['a', 'b', 'c'].map |$i, $v| { [$i, $v]})
# String "abc" to Hash with index results in
# {0 => 'a', 1 => 'b', 2 => 'c'}
Hash(Array("abc").map |$i,$v| { [$i, $v]})
"abc".to(Array).map |$i,$v| { [$i, $v]}.to(Hash)
Signature 1
unique(String $string, Optional[Callable[String]] &$block)
Signature 2
unique(Hash $hash, Optional[Callable[Any]] &$block)
Signature 3
unique(Array $array, Optional[Callable[Any]] &$block)
Signature 4
unique(Iterable $iterable, Optional[Callable[Any]] &$block)
unwrap
Unwraps a Sensitive value and returns the wrapped object.
$plaintext = 'hunter2'
$pw = Sensitive.new($plaintext)
notice("Wrapped object is $pw") #=> Prints "Wrapped object is Sensitive [value redacted]"
$unwrapped = $pw.unwrap
notice("Unwrapped object is $unwrapped") #=> Prints "Unwrapped object is hunter2"
You can optionally pass a block to unwrap in order to limit the scope where the unwrapped value is visible.
$pw = Sensitive.new('hunter2')
notice("Wrapped object is $pw") #=> Prints "Wrapped object is Sensitive [value redacted]"
$pw.unwrap |$unwrapped| {
$conf = inline_template("password: ${unwrapped}\n")
Sensitive.new($conf)
} #=> Returns a new Sensitive object containing an interpolated config file
# $unwrapped is now out of scope
unwrap(Sensitive $arg, Optional[Callable] &$block)
upcase
Converts a String, Array or Hash (recursively) into upper case.
This function is compatible with the stdlib function with the same name.
The function does the following:
String
, its upper case version is returned. This is done using Ruby system locale which handles some, but not all
special international up-casing rules (for example German double-s ß is upcased to “SS”, whereas upper case double-s is downcased to
ß).Array
and Hash
the conversion to upper case is recursive and each key and value must be convertible by
this function.Hash
is converted, some keys could result in the same key - in those cases, the latest key-value wins. For example
if keys “aBC”, and “abC” where both present, after upcase there would only be one key “ABC”.Numeric
it is simply returned (this is for backwards compatibility).Please note: This function relies directly on Ruby’s String implementation and as such may not be entirely UTF8 compatible. To ensure best compatibility please use this function with Ruby 2.4.0 or greater - https://bugs.ruby-lang.org/issues/10085.
'hello'.upcase()
upcase('hello')
Would both result in “HELLO”
['a', 'b'].upcase()
upcase(['a', 'b'])
Would both result in [‘A’, ‘B’]
{'a' => 'hello', 'b' => 'goodbye'}.upcase()
Would result in {'A' => 'HELLO', 'B' => 'GOODBYE'}
['a', 'b', ['c', ['d']], {'x' => 'y'}].upcase
Would result in ['A', 'B', ['C', ['D']], {'X' => 'Y'}]
Signature 1
upcase(Numeric $arg)
Signature 2
upcase(String $arg)
Signature 3
upcase(Array[StringData] $arg)
Signature 4
upcase(Hash[StringData, StringData] $arg)
values
Returns the values of a hash as an Array
$hsh = {"apples" => 3, "oranges" => 4 }
$hsh.values()
values($hsh)
# both results in the array [3, 4]
undef
) unless it is constrained with a
Hash
data type that narrows the allowed data types.values(Hash $hsh)
versioncmp
Compares two version numbers.
Prototype:
\$result = versioncmp(a, b)
Where a and b are arbitrary version strings.
This function returns:
1
if version a is greater than version b0
if the versions are equal-1
if version a is less than version bThis function uses the same version comparison algorithm used by Puppet’s package
type.
versioncmp(String $a, String $b)
warning
Logs a message on the server at level warning
.
warning(Any *$values)
*values
— The values to log.Return type(s): Undef
.
with
Calls a lambda with the given arguments and returns the result.
Since a lambda’s scope is local to the lambda, you can
use the with
function to create private blocks of code within a class using variables whose values cannot be accessed outside of
the lambda.
# Concatenate three strings into a single string formatted as a list.
$fruit = with("apples", "oranges", "bananas") |$x, $y, $z| {
"${x}, ${y}, and ${z}"
}
$check_var = $x
# $fruit contains "apples, oranges, and bananas"
# $check_var is undefined, as the value of $x is local to the lambda.
with(Any *$arg, Callable &$block)
yaml_data
The yaml_data
is a hiera 5 data_hash
data provider function. See the configuration guide
documentation for how to use this function.
yaml_data(Struct[{path=>String[1]}] $options, Puppet::LookupContext $context)
NOTE: This page was generated from the Puppet source code on 2020-06-30 08:58:23 +0100